125979990 has 32 divisors (see below), whose sum is σ = 302857056. Its totient is φ = 33538560.

The previous prime is 125979983. The next prime is 125979991. The reversal of 125979990 is 99979521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125979991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16654 + ... + 23006.

It is an arithmetic number, because the mean of its divisors is an integer number (9464283).

Almost surely, 2^125979990 is an apocalyptic number.

125979990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125979990 is an abundant number, since it is smaller than the sum of its proper divisors (176877066).

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

125979990 is a wasteful number, since it uses less digits than its factorization.

125979990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024.

The product of its (nonzero) digits is 459270, while the sum is 51.

The square root of 125979990 is about 11224.0808086899. The cubic root of 125979990 is about 501.3032534429.

The spelling of 125979990 in words is "one hundred twenty-five million, nine hundred seventy-nine thousand, nine hundred ninety".