1639636834 has 16 divisors (see below), whose sum is σ = 2799696960. Its totient is φ = 712885360.

The previous prime is 1639636813. The next prime is 1639636837. The reversal of 1639636834 is 4386369361.

It is not an unprimeable number, because it can be changed into a prime (1639636837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1619689 + ... + 1620700.

It is an arithmetic number, because the mean of its divisors is an integer number (174981060).

Almost surely, 2^1639636834 is an apocalyptic number.

1639636834 is a deficient number, since it is larger than the sum of its proper divisors (1160060126).

1639636834 is a wasteful number, since it uses less digits than its factorization.

1639636834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240425.

The product of its digits is 1679616, while the sum is 49.

The square root of 1639636834 is about 40492.4293417918. The cubic root of 1639636834 is about 1179.1866543900.

The spelling of 1639636834 in words is "one billion, six hundred thirty-nine million, six hundred thirty-six thousand, eight hundred thirty-four".