126993690 has 32 divisors (see below), whose sum is σ = 338650560. Its totient is φ = 33864912.

The previous prime is 126993683. The next prime is 126993707. The reversal of 126993690 is 96399621.

It is a happy number.

It is a super-2 number, since 2×126993690² = 32254794599632200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 234904 + ... + 235443.

It is an arithmetic number, because the mean of its divisors is an integer number (10582830).

Almost surely, 2^126993690 is an apocalyptic number.

126993690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126993690 is an abundant number, since it is smaller than the sum of its proper divisors (211656870).

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

126993690 is a wasteful number, since it uses less digits than its factorization.

126993690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470363 (or 470357 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 126993690 is about 11269.1477051284. The cubic root of 126993690 is about 502.6442446226.

The spelling of 126993690 in words is "one hundred twenty-six million, nine hundred ninety-three thousand, six hundred ninety".