399879007 has 8 divisors (see below), whose sum is σ = 436383360. Its totient is φ = 363399960.

The previous prime is 399878993. The next prime is 399879023. The reversal of 399879007 is 700978993.

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

It is a de Polignac number, because none of the positive numbers 2^k-399879007 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 (399879307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44544 + ... + 52762.

It is an arithmetic number, because the mean of its divisors is an integer number (54547920).

Almost surely, 2^399879007 is an apocalyptic number.

399879007 is a deficient number, since it is larger than the sum of its proper divisors (36504353).

399879007 is a wasteful number, since it uses less digits than its factorization.

399879007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12653.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 399879007 is about 19996.9749462262. The cubic root of 399879007 is about 736.7320018991.

The spelling of 399879007 in words is "three hundred ninety-nine million, eight hundred seventy-nine thousand, seven".