126921984 has 72 divisors (see below), whose sum is σ = 386070720. Its totient is φ = 36261888.

The previous prime is 126921979. The next prime is 126922007. The reversal of 126921984 is 489129621.

It is a super-2 number, since 2×126921984² = 32218380044992512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6429 + ... + 17180.

Almost surely, 2^126921984 is an apocalyptic number.

126921984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

126921984 is an abundant number, since it is smaller than the sum of its proper divisors (259148736).

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

126921984 is an equidigital number, since it uses as much as digits as its factorization.

126921984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23635 (or 23621 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 126921984 is about 11265.9657375655. The cubic root of 126921984 is about 502.5496220891.

The spelling of 126921984 in words is "one hundred twenty-six million, nine hundred twenty-one thousand, nine hundred eighty-four".