125139405 has 16 divisors (see below), whose sum is σ = 206682624. Its totient is φ = 64587840.

The previous prime is 125139401. The next prime is 125139419. The reversal of 125139405 is 504931521.

It is not a de Polignac number, because 125139405 - 2² = 125139401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125139401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134094 + ... + 135023.

It is an arithmetic number, because the mean of its divisors is an integer number (12917664).

Almost surely, 2^125139405 is an apocalyptic number.

125139405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125139405 is a deficient number, since it is larger than the sum of its proper divisors (81543219).

125139405 is a wasteful number, since it uses less digits than its factorization.

125139405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269156.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 125139405 is about 11186.5725313878. The cubic root of 125139405 is about 500.1858042783.

The spelling of 125139405 in words is "one hundred twenty-five million, one hundred thirty-nine thousand, four hundred five".