393972465 has 16 divisors (see below), whose sum is σ = 640691136. Its totient is φ = 206673600.

The previous prime is 393972463. The next prime is 393972517. The reversal of 393972465 is 564279393.

It is a happy number.

It is not a de Polignac number, because 393972465 - 2¹ = 393972463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (393972461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214371 + ... + 216200.

It is an arithmetic number, because the mean of its divisors is an integer number (40043196).

Almost surely, 2^393972465 is an apocalyptic number.

It is an amenable number.

393972465 is a deficient number, since it is larger than the sum of its proper divisors (246718671).

393972465 is a wasteful number, since it uses less digits than its factorization.

393972465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430640.

The product of its digits is 1224720, while the sum is 48.

The square root of 393972465 is about 19848.7396325308. The cubic root of 393972465 is about 733.0866147779.

The spelling of 393972465 in words is "three hundred ninety-three million, nine hundred seventy-two thousand, four hundred sixty-five".