17940451994 has 16 divisors (see below), whose sum is σ = 27021876648. Its totient is φ = 8933213952.

The previous prime is 17940451987. The next prime is 17940452003. The reversal of 17940451994 is 49915404971.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3213415969 + 14727036025 = 56687^2 + 121355^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686414 + ... + 712070.

Almost surely, 2^17940451994 is an apocalyptic number.

17940451994 is a deficient number, since it is larger than the sum of its proper divisors (9081424654).

17940451994 is a wasteful number, since it uses less digits than its factorization.

17940451994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27089.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 17940451994 in words is "seventeen billion, nine hundred forty million, four hundred fifty-one thousand, nine hundred ninety-four".