1039640694 has 8 divisors (see below), whose sum is σ = 2079281400. Its totient is φ = 346546896.

The previous prime is 1039640663. The next prime is 1039640699. The reversal of 1039640694 is 4960469301.

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

1039640694 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1039640699) 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, 86636719 + ... + 86636730.

It is an arithmetic number, because the mean of its divisors is an integer number (259910175).

Almost surely, 2^1039640694 is an apocalyptic number.

1039640694 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1039640694 is a wasteful number, since it uses less digits than its factorization.

1039640694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173273454.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 1039640694 is about 32243.4597089084. The cubic root of 1039640694 is about 1013.0427127356.

The spelling of 1039640694 in words is "one billion, thirty-nine million, six hundred forty thousand, six hundred ninety-four".