388890025 has 12 divisors (see below), whose sum is σ = 482880924. Its totient is φ = 310688000.

The previous prime is 388890023. The next prime is 388890031. The reversal of 388890025 is 520098883.

It can be written as a sum of positive squares in 6 ways, for example, as 38601369 + 350288656 = 6213^2 + 18716^2 .

It is not a de Polignac number, because 388890025 - 2¹ = 388890023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388890023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8805 + ... + 29245.

It is an arithmetic number, because the mean of its divisors is an integer number (40240077).

Almost surely, 2^388890025 is an apocalyptic number.

It is an amenable number.

388890025 is a deficient number, since it is larger than the sum of its proper divisors (93990899).

388890025 is a wasteful number, since it uses less digits than its factorization.

388890025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21212 (or 21207 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 388890025 is about 19720.2947493185. The cubic root of 388890025 is about 729.9205674502.

The spelling of 388890025 in words is "three hundred eighty-eight million, eight hundred ninety thousand, twenty-five".