125431540 has 48 divisors (see below), whose sum is σ = 298609920. Its totient is φ = 43873920.

The previous prime is 125431531. The next prime is 125431541. The reversal of 125431540 is 45134521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125431541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7756 + ... + 17635.

It is an arithmetic number, because the mean of its divisors is an integer number (6221040).

Almost surely, 2^125431540 is an apocalyptic number.

125431540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125431540 is an abundant number, since it is smaller than the sum of its proper divisors (173178380).

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

125431540 is a wasteful number, since it uses less digits than its factorization.

125431540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25432 (or 25430 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 125431540 is about 11199.6223150605. The cubic root of 125431540 is about 500.5747257941.

It can be divided in two parts, 12543 and 1540, that multiplied together give a triangular number (19316220 = T₆₂₁₅).

The spelling of 125431540 in words is "one hundred twenty-five million, four hundred thirty-one thousand, five hundred forty".