125139840 has 128 divisors (see below), whose sum is σ = 455915520. Its totient is φ = 28600320.

The previous prime is 125139829. The next prime is 125139851. The reversal of 125139840 is 48931521.

It is an interprime number because it is at equal distance from previous prime (125139829) and next prime (125139851).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8785 + ... + 18095.

It is an arithmetic number, because the mean of its divisors is an integer number (3561840).

Almost surely, 2^125139840 is an apocalyptic number.

125139840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227957760).

125139840 is an abundant number, since it is smaller than the sum of its proper divisors (330775680).

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

125139840 is an equidigital number, since it uses as much as digits as its factorization.

125139840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9340 (or 9328 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 125139840 is about 11186.5919743235. The cubic root of 125139840 is about 500.1863838468.

The spelling of 125139840 in words is "one hundred twenty-five million, one hundred thirty-nine thousand, eight hundred forty".