161897390 has 8 divisors (see below), whose sum is σ = 291415320. Its totient is φ = 64758952.

The previous prime is 161897387. The next prime is 161897413. The reversal of 161897390 is 93798161.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8094860 + ... + 8094879.

It is an arithmetic number, because the mean of its divisors is an integer number (36426915).

Almost surely, 2^161897390 is an apocalyptic number.

161897390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161897390 is a deficient number, since it is larger than the sum of its proper divisors (129517930).

161897390 is a wasteful number, since it uses less digits than its factorization.

161897390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16189746.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 161897390 is about 12723.8905213775. The cubic root of 161897390 is about 545.0210580198.

The spelling of 161897390 in words is "one hundred sixty-one million, eight hundred ninety-seven thousand, three hundred ninety".