399145635 has 96 divisors (see below), whose sum is σ = 881487360. Its totient is φ = 162653184.

The previous prime is 399145613. The next prime is 399145639. The reversal of 399145635 is 536541993.

399145635 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 4 + 5 + 635 = 666.

It is not a de Polignac number, because 399145635 - 2¹⁸ = 398883491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (399145639) 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 95 ways as a sum of consecutive naturals, for example, 99784 + ... + 103706.

It is an arithmetic number, because the mean of its divisors is an integer number (9182160).

Almost surely, 2^399145635 is an apocalyptic number.

399145635 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

399145635 is an abundant number, since it is smaller than the sum of its proper divisors (482341725).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399145635 is a wasteful number, since it uses less digits than its factorization.

399145635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977 (or 3974 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The square root of 399145635 is about 19978.6294574978. The cubic root of 399145635 is about 736.2813412001.

The spelling of 399145635 in words is "three hundred ninety-nine million, one hundred forty-five thousand, six hundred thirty-five".