161399700 has 432 divisors, whose sum is σ = 672706944. Its totient is φ = 31334400.

The previous prime is 161399687. The next prime is 161399723. The reversal of 161399700 is 7993161.

161399700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1178032 + ... + 1178168.

It is an arithmetic number, because the mean of its divisors is an integer number (1557192).

Almost surely, 2^161399700 is an apocalyptic number.

161399700 is a gapful number since it is divisible by the number (10) 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 161399700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336353472).

161399700 is an abundant number, since it is smaller than the sum of its proper divisors (511307244).

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

161399700 is a wasteful number, since it uses less digits than its factorization.

161399700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 161399700 is about 12704.3181635222. The cubic root of 161399700 is about 544.4620002977.

The spelling of 161399700 in words is "one hundred sixty-one million, three hundred ninety-nine thousand, seven hundred".