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399549421 = 3137438101
BaseRepresentation
bin10111110100001…
…010001111101101
31000211211012202201
4113310022033231
51304241040141
6103351421501
712621054055
oct2764121755
91024735681
10399549421
11195598437
12b1984891
1364a1449b
143b0c8565
1525125031
hex17d0a3ed

399549421 has 16 divisors (see below), whose sum is σ = 433489408. Its totient is φ = 367416000.

The previous prime is 399549413. The next prime is 399549427. The reversal of 399549421 is 124945993.

It is a cyclic number.

It is not a de Polignac number, because 399549421 - 23 = 399549413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399549427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45271 + ... + 53371.

It is an arithmetic number, because the mean of its divisors is an integer number (27093088).

Almost surely, 2399549421 is an apocalyptic number.

399549421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

399549421 is the 11541-st hex number.

It is an amenable number.

399549421 is a deficient number, since it is larger than the sum of its proper divisors (33939987).

399549421 is a wasteful number, since it uses less digits than its factorization.

399549421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212.

The product of its digits is 349920, while the sum is 46.

The square root of 399549421 is about 19988.7323510022. The cubic root of 399549421 is about 736.5295379114.

The spelling of 399549421 in words is "three hundred ninety-nine million, five hundred forty-nine thousand, four hundred twenty-one".

Divisors: 1 31 37 43 1147 1333 1591 8101 49321 251131 299737 348343 9291847 10798633 12888691 399549421