126515920 has 20 divisors (see below), whose sum is σ = 294149700. Its totient is φ = 50606336.

The previous prime is 126515911. The next prime is 126515969. The reversal of 126515920 is 29515621.

It can be written as a sum of positive squares in 2 ways, for example, as 30162064 + 96353856 = 5492^2 + 9816^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790645 + ... + 790804.

It is an arithmetic number, because the mean of its divisors is an integer number (14707485).

Almost surely, 2^126515920 is an apocalyptic number.

126515920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126515920 is an abundant number, since it is smaller than the sum of its proper divisors (167633780).

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

126515920 is a wasteful number, since it uses less digits than its factorization.

126515920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581462 (or 1581456 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 126515920 is about 11247.9295872618. The cubic root of 126515920 is about 502.0131105606.

The spelling of 126515920 in words is "one hundred twenty-six million, five hundred fifteen thousand, nine hundred twenty".