1694686138 has 8 divisors (see below), whose sum is σ = 2652552288. Its totient is φ = 810502044.

The previous prime is 1694686109. The next prime is 1694686139. The reversal of 1694686138 is 8316864961.

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

It is a super-2 number, since 2×1694686138² = 5743922212658710088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1694686139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18420456 + ... + 18420547.

It is an arithmetic number, because the mean of its divisors is an integer number (331569036).

Almost surely, 2^1694686138 is an apocalyptic number.

1694686138 is a deficient number, since it is larger than the sum of its proper divisors (957866150).

1694686138 is a wasteful number, since it uses less digits than its factorization.

1694686138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36841028.

The product of its digits is 1492992, while the sum is 52.

The square root of 1694686138 is about 41166.5657785538. The cubic root of 1694686138 is about 1192.2383636079.

The spelling of 1694686138 in words is "one billion, six hundred ninety-four million, six hundred eighty-six thousand, one hundred thirty-eight".