399950721225 has 60 divisors (see below), whose sum is σ = 808196761680. Its totient is φ = 193915490400.

The previous prime is 399950721089. The next prime is 399950721229. The reversal of 399950721225 is 522127059993.

399950721225 is a `hidden beast` number, since 3 + 9 + 9 + 9 + 507 + 2 + 122 + 5 = 666.

It is not a de Polignac number, because 399950721225 - 2⁸ = 399950720969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399950721229) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 8955295 + ... + 8999844.

It is an arithmetic number, because the mean of its divisors is an integer number (13469946028).

Almost surely, 2^399950721225 is an apocalyptic number.

It is an amenable number.

399950721225 is an abundant number, since it is smaller than the sum of its proper divisors (408246040455).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399950721225 is a wasteful number, since it uses less digits than its factorization.

399950721225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17955172 (or 17955158 counting only the distinct ones).

The product of its (nonzero) digits is 3061800, while the sum is 54.

The spelling of 399950721225 in words is "three hundred ninety-nine billion, nine hundred fifty million, seven hundred twenty-one thousand, two hundred twenty-five".