161399808 has 132 divisors (see below), whose sum is σ = 473888688. Its totient is φ = 52899840.

The previous prime is 161399789. The next prime is 161399863. The reversal of 161399808 is 808993161.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 764823 + ... + 765033.

Almost surely, 2^161399808 is an apocalyptic number.

161399808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161399808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236944344).

161399808 is an abundant number, since it is smaller than the sum of its proper divisors (312488880).

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

161399808 is a wasteful number, since it uses less digits than its factorization.

161399808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 161399808 is about 12704.3224140448. The cubic root of 161399808 is about 544.4621217393.

The spelling of 161399808 in words is "one hundred sixty-one million, three hundred ninety-nine thousand, eight hundred eight".