390725550 has 144 divisors (see below), whose sum is σ = 1114369152. Its totient is φ = 97977600.

The previous prime is 390725539. The next prime is 390725579. The reversal of 390725550 is 55527093.

390725550 is a `hidden beast` number, since 39 + 0 + 72 + 5 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 515772 + ... + 516528.

Almost surely, 2^390725550 is an apocalyptic number.

390725550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 390725550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (557184576).

390725550 is an abundant number, since it is smaller than the sum of its proper divisors (723643602).

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

390725550 is a wasteful number, since it uses less digits than its factorization.

390725550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 835 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 36.

The square root of 390725550 is about 19766.7789485288. The cubic root of 390725550 is about 731.0671513021.

The spelling of 390725550 in words is "three hundred ninety million, seven hundred twenty-five thousand, five hundred fifty".