399031645 has 8 divisors (see below), whose sum is σ = 489026304. Its totient is φ = 312433104.

The previous prime is 399031631. The next prime is 399031657. The reversal of 399031645 is 546130993.

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 399031645 - 2¹¹ = 399029597 is a prime.

It is a super-2 number, since 2×399031645² = 318452507422812050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399031598 and 399031607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848769 + ... + 849238.

It is an arithmetic number, because the mean of its divisors is an integer number (61128288).

Almost surely, 2^399031645 is an apocalyptic number.

It is an amenable number.

399031645 is a deficient number, since it is larger than the sum of its proper divisors (89994659).

399031645 is a wasteful number, since it uses less digits than its factorization.

399031645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698059.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 399031645 is about 19975.7764554973. The cubic root of 399031645 is about 736.2112442283.

The spelling of 399031645 in words is "three hundred ninety-nine million, thirty-one thousand, six hundred forty-five".