1609138536 has 32 divisors (see below), whose sum is σ = 4259485440. Its totient is φ = 504827648.

The previous prime is 1609138511. The next prime is 1609138541. The reversal of 1609138536 is 6358319061.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1971576 + ... + 1972391.

It is an arithmetic number, because the mean of its divisors is an integer number (133108920).

Almost surely, 2^1609138536 is an apocalyptic number.

It is an amenable number.

1609138536 is an abundant number, since it is smaller than the sum of its proper divisors (2650346904).

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

1609138536 is a wasteful number, since it uses less digits than its factorization.

1609138536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943993 (or 3943989 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1609138536 is about 40114.0690531389. The cubic root of 1609138536 is about 1171.8296393379.

The spelling of 1609138536 in words is "one billion, six hundred nine million, one hundred thirty-eight thousand, five hundred thirty-six".