393978500825 has 24 divisors (see below), whose sum is σ = 601271807808. Its totient is φ = 249375401280.

The previous prime is 393978500803. The next prime is 393978500843. The reversal of 393978500825 is 528005879393.

It is not a de Polignac number, because 393978500825 - 2⁶ = 393978500761 is a prime.

It is a super-2 number, since 2×393978500825² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86586407 + ... + 86590956.

It is an arithmetic number, because the mean of its divisors is an integer number (25052991992).

Almost surely, 2^393978500825 is an apocalyptic number.

393978500825 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

393978500825 is a deficient number, since it is larger than the sum of its proper divisors (207293306983).

393978500825 is a wasteful number, since it uses less digits than its factorization.

393978500825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173177393 (or 173177388 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 59.

The spelling of 393978500825 in words is "three hundred ninety-three billion, nine hundred seventy-eight million, five hundred thousand, eight hundred twenty-five".