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400011001 = 13222710427
BaseRepresentation
bin10111110101111…
…010111011111001
31000212200122221021
4113311322323321
51304400323001
6103405342441
712625015555
oct2765727371
91025618837
10400011001
11195883205
12b1b67a21
1364b46600
143b1a8865
15251b6ba1
hex17d7aef9

400011001 has 12 divisors (see below), whose sum is σ = 435097872. Its totient is φ = 367579056.

The previous prime is 400010993. The next prime is 400011041. The reversal of 400011001 is 100110004.

It is a happy number.

It is not a de Polignac number, because 400011001 - 23 = 400010993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400011041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33150 + ... + 43576.

It is an arithmetic number, because the mean of its divisors is an integer number (36258156).

Almost surely, 2400011001 is an apocalyptic number.

It is an amenable number.

400011001 is a deficient number, since it is larger than the sum of its proper divisors (35086871).

400011001 is a wasteful number, since it uses less digits than its factorization.

400011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680 (or 10667 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 400011001 is about 20000.2750231091. The cubic root of 400011001 is about 736.8130543379.

Adding to 400011001 its reverse (100110004), we get a palindrome (500121005).

The spelling of 400011001 in words is "four hundred million, eleven thousand, one".

Divisors: 1 13 169 227 2951 10427 38363 135551 1762163 2366929 30770077 400011001