165420398 has 32 divisors (see below), whose sum is σ = 298311552. Its totient is φ = 67788000.

The previous prime is 165420383. The next prime is 165420407. The reversal of 165420398 is 893024561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5573 + ... + 19023.

It is an arithmetic number, because the mean of its divisors is an integer number (9322236).

Almost surely, 2^165420398 is an apocalyptic number.

165420398 is a deficient number, since it is larger than the sum of its proper divisors (132891154).

165420398 is a wasteful number, since it uses less digits than its factorization.

165420398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13520.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 165420398 is about 12861.5861385756. The cubic root of 165420398 is about 548.9460787141.

The spelling of 165420398 in words is "one hundred sixty-five million, four hundred twenty thousand, three hundred ninety-eight".