399689371 has 8 divisors (see below), whose sum is σ = 408387600. Its totient is φ = 391071648.

The previous prime is 399689359. The next prime is 399689383. The reversal of 399689371 is 173986993.

It is an interprime number because it is at equal distance from previous prime (399689359) and next prime (399689383).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399689371 - 2¹³ = 399681179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399689341) 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 7 ways as a sum of consecutive naturals, for example, 10036 + ... + 30001.

It is an arithmetic number, because the mean of its divisors is an integer number (51048450).

Almost surely, 2^399689371 is an apocalyptic number.

399689371 is a deficient number, since it is larger than the sum of its proper divisors (8698229).

399689371 is a wasteful number, since it uses less digits than its factorization.

399689371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40253.

The product of its digits is 2204496, while the sum is 55.

The square root of 399689371 is about 19992.2327667522. The cubic root of 399689371 is about 736.6155224987.

The spelling of 399689371 in words is "three hundred ninety-nine million, six hundred eighty-nine thousand, three hundred seventy-one".