126891904 has 16 divisors (see below), whose sum is σ = 252792720. Its totient is φ = 63445888.

The previous prime is 126891901. The next prime is 126891913. The reversal of 126891904 is 409198621.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×126891904² = 32203110601490432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126891901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495544 + ... + 495799.

It is an arithmetic number, because the mean of its divisors is an integer number (15799545).

Almost surely, 2^126891904 is an apocalyptic number.

It is an amenable number.

126891904 is a deficient number, since it is larger than the sum of its proper divisors (125900816).

126891904 is an frugal number, since it uses more digits than its factorization.

126891904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991357 (or 991345 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 126891904 is about 11264.6306641629. The cubic root of 126891904 is about 502.5099182056.

The spelling of 126891904 in words is "one hundred twenty-six million, eight hundred ninety-one thousand, nine hundred four".