125139987 has 48 divisors (see below), whose sum is σ = 218949120. Its totient is φ = 67326336.

The previous prime is 125139983. The next prime is 125140021. The reversal of 125139987 is 789931521.

125139987 is a `hidden beast` number, since 1 + 251 + 399 + 8 + 7 = 666.

It is not a de Polignac number, because 125139987 - 2² = 125139983 is a prime.

It is a super-4 number, since 4×125139987⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (125139983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96439 + ... + 97727.

It is an arithmetic number, because the mean of its divisors is an integer number (4561440).

Almost surely, 2^125139987 is an apocalyptic number.

125139987 is a deficient number, since it is larger than the sum of its proper divisors (93809133).

125139987 is a wasteful number, since it uses less digits than its factorization.

125139987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 1389 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 125139987 is about 11186.5985446873. The cubic root of 125139987 is about 500.1865797007.

It can be divided in two parts, 12513 and 9987, that added together give a square (22500 = 150²).

The spelling of 125139987 in words is "one hundred twenty-five million, one hundred thirty-nine thousand, nine hundred eighty-seven".