399965054644 has 24 divisors (see below), whose sum is σ = 724234379400. Its totient is φ = 193043988480.

The previous prime is 399965054641. The next prime is 399965054681. The reversal of 399965054644 is 446450569993.

It can be written as a sum of positive squares in 4 ways, for example, as 132015955600 + 267949099044 = 363340^2 + 517638^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399965054641) 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, 151092 + ... + 907060.

It is an arithmetic number, because the mean of its divisors is an integer number (30176432475).

Almost surely, 2^399965054644 is an apocalyptic number.

It is an amenable number.

399965054644 is a deficient number, since it is larger than the sum of its proper divisors (324269324756).

399965054644 is a wasteful number, since it uses less digits than its factorization.

399965054644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760563 (or 760561 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 64.

The spelling of 399965054644 in words is "three hundred ninety-nine billion, nine hundred sixty-five million, fifty-four thousand, six hundred forty-four".