126137865 has 64 divisors (see below), whose sum is σ = 253440000. Its totient is φ = 52233984.

The previous prime is 126137863. The next prime is 126137959. The reversal of 126137865 is 568731621.

It is not a de Polignac number, because 126137865 - 2¹ = 126137863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126137861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44511 + ... + 47259.

It is an arithmetic number, because the mean of its divisors is an integer number (3960000).

Almost surely, 2^126137865 is an apocalyptic number.

126137865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126137865 is an abundant number, since it is smaller than the sum of its proper divisors (127302135).

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

126137865 is a wasteful number, since it uses less digits than its factorization.

126137865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806.

The product of its digits is 60480, while the sum is 39.

The square root of 126137865 is about 11231.1114766082. Note that the first 3 decimals coincide. The cubic root of 126137865 is about 501.5125729653.

The spelling of 126137865 in words is "one hundred twenty-six million, one hundred thirty-seven thousand, eight hundred sixty-five".