39400466721 has 128 divisors (see below), whose sum is σ = 70731988992. Its totient is φ = 18883200000.

The previous prime is 39400466717. The next prime is 39400466773. The reversal of 39400466721 is 12766400493.

It is not a de Polignac number, because 39400466721 - 2² = 39400466717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39400466711) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 69982786 + ... + 69983348.

It is an arithmetic number, because the mean of its divisors is an integer number (552593664).

Almost surely, 2^39400466721 is an apocalyptic number.

It is an amenable number.

39400466721 is a deficient number, since it is larger than the sum of its proper divisors (31331522271).

39400466721 is a wasteful number, since it uses less digits than its factorization.

39400466721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 39400466721 in words is "thirty-nine billion, four hundred million, four hundred sixty-six thousand, seven hundred twenty-one".