525423990 has 64 divisors (see below), whose sum is σ = 1552029696. Its totient is φ = 110858112.

The previous prime is 525423989. The next prime is 525424051. The reversal of 525423990 is 99324525.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93502 + ... + 98961.

It is an arithmetic number, because the mean of its divisors is an integer number (24250464).

Almost surely, 2^525423990 is an apocalyptic number.

525423990 is an abundant number, since it is smaller than the sum of its proper divisors (1026605706).

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

525423990 is a wasteful number, since it uses less digits than its factorization.

525423990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192493.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 525423990 is about 22922.1288278380. The cubic root of 525423990 is about 806.9314320728.

The spelling of 525423990 in words is "five hundred twenty-five million, four hundred twenty-three thousand, nine hundred ninety".