126921786 has 16 divisors (see below), whose sum is σ = 267204000. Its totient is φ = 40080528.

The previous prime is 126921757. The next prime is 126921787. The reversal of 126921786 is 687129621.

It is a super-2 number, since 2×126921786² = 32218279522859592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (126921787) 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, 556561 + ... + 556788.

It is an arithmetic number, because the mean of its divisors is an integer number (16700250).

Almost surely, 2^126921786 is an apocalyptic number.

126921786 is an abundant number, since it is smaller than the sum of its proper divisors (140282214).

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

126921786 is a wasteful number, since it uses less digits than its factorization.

126921786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113373.

The product of its digits is 72576, while the sum is 42.

The square root of 126921786 is about 11265.9569500331. The cubic root of 126921786 is about 502.5493607609.

The spelling of 126921786 in words is "one hundred twenty-six million, nine hundred twenty-one thousand, seven hundred eighty-six".