125309820 has 24 divisors (see below), whose sum is σ = 350867664. Its totient is φ = 33415936.

The previous prime is 125309813. The next prime is 125309827. The reversal of 125309820 is 28903521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (125309813) and next prime (125309827).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125309827) 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, 1044189 + ... + 1044308.

It is an arithmetic number, because the mean of its divisors is an integer number (14619486).

Almost surely, 2^125309820 is an apocalyptic number.

125309820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125309820 is an abundant number, since it is smaller than the sum of its proper divisors (225557844).

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

125309820 is a wasteful number, since it uses less digits than its factorization.

125309820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088509 (or 2088507 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 125309820 is about 11194.1868842717. The cubic root of 125309820 is about 500.4127525103.

The spelling of 125309820 in words is "one hundred twenty-five million, three hundred nine thousand, eight hundred twenty".