1604015994 has 32 divisors (see below), whose sum is σ = 3881990016. Its totient is φ = 431331840.

The previous prime is 1604015993. The next prime is 1604016019. The reversal of 1604015994 is 4995104061.

It is not an unprimeable number, because it can be changed into a prime (1604015993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122547 + ... + 1123974.

It is an arithmetic number, because the mean of its divisors is an integer number (121312188).

Almost surely, 2^1604015994 is an apocalyptic number.

1604015994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1604015994 is an abundant number, since it is smaller than the sum of its proper divisors (2277974022).

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

1604015994 is a wasteful number, since it uses less digits than its factorization.

1604015994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246550.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 1604015994 is about 40050.1684640652. The cubic root of 1604015994 is about 1170.5848474971.

The spelling of 1604015994 in words is "one billion, six hundred four million, fifteen thousand, nine hundred ninety-four".