39440564121 has 32 divisors (see below), whose sum is σ = 61139681280. Its totient is φ = 22150872576.

The previous prime is 39440564117. The next prime is 39440564129. The reversal of 39440564121 is 12146504493.

It is not a de Polignac number, because 39440564121 - 2² = 39440564117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39440564121.

It is not an unprimeable number, because it can be changed into a prime (39440564129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216265 + ... + 354473.

It is an arithmetic number, because the mean of its divisors is an integer number (1910615040).

Almost surely, 2^39440564121 is an apocalyptic number.

It is an amenable number.

39440564121 is a deficient number, since it is larger than the sum of its proper divisors (21699117159).

39440564121 is a wasteful number, since it uses less digits than its factorization.

39440564121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138453.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 39440564121 in words is "thirty-nine billion, four hundred forty million, five hundred sixty-four thousand, one hundred twenty-one".