399240605966 has 16 divisors (see below), whose sum is σ = 623142310464. Its totient is φ = 191686775904.

The previous prime is 399240605957. The next prime is 399240605971. The reversal of 399240605966 is 669506042993.

It is a super-2 number, since 2×399240605966² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

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, 40063325 + ... + 40073288.

It is an arithmetic number, because the mean of its divisors is an integer number (38946394404).

Almost surely, 2^399240605966 is an apocalyptic number.

399240605966 is a deficient number, since it is larger than the sum of its proper divisors (223901704498).

399240605966 is a wasteful number, since it uses less digits than its factorization.

399240605966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80136715.

The product of its (nonzero) digits is 18895680, while the sum is 59.

The spelling of 399240605966 in words is "three hundred ninety-nine billion, two hundred forty million, six hundred five thousand, nine hundred sixty-six".