125402391 has 8 divisors (see below), whose sum is σ = 185781360. Its totient is φ = 83601576.

The previous prime is 125402377. The next prime is 125402419. The reversal of 125402391 is 193204521.

125402391 is a `hidden beast` number, since 12 + 540 + 23 + 91 = 666.

It is not a de Polignac number, because 125402391 - 2⁶ = 125402327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4644533 = 125402391 / (1 + 2 + 5 + 4 + 0 + 2 + 3 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125402311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2322240 + ... + 2322293.

It is an arithmetic number, because the mean of its divisors is an integer number (23222670).

Almost surely, 2^125402391 is an apocalyptic number.

125402391 is a deficient number, since it is larger than the sum of its proper divisors (60378969).

125402391 is an equidigital number, since it uses as much as digits as its factorization.

125402391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644542 (or 4644536 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 125402391 is about 11198.3209009208. The cubic root of 125402391 is about 500.5359466504.

The spelling of 125402391 in words is "one hundred twenty-five million, four hundred two thousand, three hundred ninety-one".