126978686 has 8 divisors (see below), whose sum is σ = 190524960. Its totient is φ = 63470368.

The previous prime is 126978623. The next prime is 126978721. The reversal of 126978686 is 686879621.

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

It is a super-2 number, since 2×126978686² = 32247173396573192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (23815620).

Almost surely, 2^126978686 is an apocalyptic number.

126978686 is a deficient number, since it is larger than the sum of its proper divisors (63546274).

126978686 is a wasteful number, since it uses less digits than its factorization.

126978686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18978.

The product of its digits is 1741824, while the sum is 53.

The square root of 126978686 is about 11268.4819740726. The cubic root of 126978686 is about 502.6244484388.

The spelling of 126978686 in words is "one hundred twenty-six million, nine hundred seventy-eight thousand, six hundred eighty-six".