126891640 has 32 divisors (see below), whose sum is σ = 286973280. Its totient is φ = 50495872.

The previous prime is 126891629. The next prime is 126891641. The reversal of 126891640 is 46198621.

It is a happy number.

It is a super-2 number, since 2×126891640² = 32202976603779200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126891640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126891641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172 + ... + 15931.

It is an arithmetic number, because the mean of its divisors is an integer number (8967915).

Almost surely, 2^126891640 is an apocalyptic number.

126891640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126891640 is an abundant number, since it is smaller than the sum of its proper divisors (160081640).

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

126891640 is a wasteful number, since it uses less digits than its factorization.

126891640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16311 (or 16307 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 126891640 is about 11264.6189460629. The cubic root of 126891640 is about 502.5095697129.

The spelling of 126891640 in words is "one hundred twenty-six million, eight hundred ninety-one thousand, six hundred forty".