1639849894 has 8 divisors (see below), whose sum is σ = 2501466120. Its totient is φ = 806027856.

The previous prime is 1639849889. The next prime is 1639849931. The reversal of 1639849894 is 4989489361.

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

It is a super-2 number, since 2×1639849894² = 5378215349703622472, 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, 6948399 + ... + 6948634.

It is an arithmetic number, because the mean of its divisors is an integer number (312683265).

Almost surely, 2^1639849894 is an apocalyptic number.

1639849894 is a deficient number, since it is larger than the sum of its proper divisors (861616226).

1639849894 is a wasteful number, since it uses less digits than its factorization.

1639849894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13897094.

The product of its digits is 13436928, while the sum is 61.

The square root of 1639849894 is about 40495.0601184885. The cubic root of 1639849894 is about 1179.2377280225.

The spelling of 1639849894 in words is "one billion, six hundred thirty-nine million, eight hundred forty-nine thousand, eight hundred ninety-four".