1694540979 has 10 divisors (see below), whose sum is σ = 2531351460. Its totient is φ = 1129693932.

The previous prime is 1694540971. The next prime is 1694540989. The reversal of 1694540979 is 9790454961.

It is a happy number.

1694540979 is a `hidden beast` number, since 1 + 6 + 9 + 4 + 540 + 97 + 9 = 666.

It is not a de Polignac number, because 1694540979 - 2³ = 1694540971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1694540971) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10460049 + ... + 10460210.

It is an arithmetic number, because the mean of its divisors is an integer number (253135146).

Almost surely, 2^1694540979 is an apocalyptic number.

1694540979 is a deficient number, since it is larger than the sum of its proper divisors (836810481).

1694540979 is an equidigital number, since it uses as much as digits as its factorization.

1694540979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20920271 (or 20920262 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 1694540979 is about 41164.8026717000. The cubic root of 1694540979 is about 1192.2043220891.

The spelling of 1694540979 in words is "one billion, six hundred ninety-four million, five hundred forty thousand, nine hundred seventy-nine".