165901398 has 32 divisors (see below), whose sum is σ = 368858112. Its totient is φ = 49399200.

The previous prime is 165901397. The next prime is 165901409. The reversal of 165901398 is 893109561.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165901391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31888 + ... + 36723.

It is an arithmetic number, because the mean of its divisors is an integer number (11526816).

Almost surely, 2^165901398 is an apocalyptic number.

165901398 is an abundant number, since it is smaller than the sum of its proper divisors (202956714).

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

165901398 is a wasteful number, since it uses less digits than its factorization.

165901398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68660.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 165901398 is about 12880.2716586258. The cubic root of 165901398 is about 549.4776285442.

The spelling of 165901398 in words is "one hundred sixty-five million, nine hundred one thousand, three hundred ninety-eight".