126993981 has 8 divisors (see below), whose sum is σ = 170339904. Its totient is φ = 84155360.

The previous prime is 126993959. The next prime is 126993983. The reversal of 126993981 is 189399621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126993981 is a prime.

It is a super-2 number, since 2×126993981² = 32254942420456722, 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 126993981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126993983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126240 + ... + 127241.

It is an arithmetic number, because the mean of its divisors is an integer number (21292488).

Almost surely, 2^126993981 is an apocalyptic number.

It is an amenable number.

126993981 is a deficient number, since it is larger than the sum of its proper divisors (43345923).

126993981 is a wasteful number, since it uses less digits than its factorization.

126993981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253651.

The product of its digits is 209952, while the sum is 48.

The square root of 126993981 is about 11269.1606164789. The cubic root of 126993981 is about 502.6446285507.

The spelling of 126993981 in words is "one hundred twenty-six million, nine hundred ninety-three thousand, nine hundred eighty-one".