125851978 has 24 divisors (see below), whose sum is σ = 217791072. Its totient is φ = 53429112.

The previous prime is 125851949. The next prime is 125851993. The reversal of 125851978 is 879158521.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554301 + ... + 554527.

It is an arithmetic number, because the mean of its divisors is an integer number (9074628).

Almost surely, 2^125851978 is an apocalyptic number.

125851978 is a deficient number, since it is larger than the sum of its proper divisors (91939094).

125851978 is an equidigital number, since it uses as much as digits as its factorization.

125851978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 435 counting only the distinct ones).

The product of its digits is 201600, while the sum is 46.

The square root of 125851978 is about 11218.3767988065. The cubic root of 125851978 is about 501.1333995364.

The spelling of 125851978 in words is "one hundred twenty-five million, eight hundred fifty-one thousand, nine hundred seventy-eight".