126139988 has 12 divisors (see below), whose sum is σ = 237725460. Its totient is φ = 58218432.

The previous prime is 126139987. The next prime is 126139991. The reversal of 126139988 is 889931621.

It can be written as a sum of positive squares in 2 ways, for example, as 80604484 + 45535504 = 8978^2 + 6748^2 .

It is a super-2 number, since 2×126139988² = 31822593145280288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126139987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212833 + ... + 1212936.

It is an arithmetic number, because the mean of its divisors is an integer number (19810455).

Almost surely, 2^126139988 is an apocalyptic number.

It is an amenable number.

126139988 is a deficient number, since it is larger than the sum of its proper divisors (111585472).

126139988 is a wasteful number, since it uses less digits than its factorization.

126139988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425786 (or 2425784 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 126139988 is about 11231.2059904536. The cubic root of 126139988 is about 501.5153865672.

The spelling of 126139988 in words is "one hundred twenty-six million, one hundred thirty-nine thousand, nine hundred eighty-eight".