161935404 has 96 divisors (see below), whose sum is σ = 431827200. Its totient is φ = 46909440.

The previous prime is 161935399. The next prime is 161935409. The reversal of 161935404 is 404539161.

It is an interprime number because it is at equal distance from previous prime (161935399) and next prime (161935409).

It is not an unprimeable number, because it can be changed into a prime (161935409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158407 + ... + 159425.

It is an arithmetic number, because the mean of its divisors is an integer number (4498200).

Almost surely, 2^161935404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161935404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215913600).

161935404 is an abundant number, since it is smaller than the sum of its proper divisors (269891796).

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

161935404 is a wasteful number, since it uses less digits than its factorization.

161935404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 161935404 is about 12725.3842378138. The cubic root of 161935404 is about 545.0637122160.

The spelling of 161935404 in words is "one hundred sixty-one million, nine hundred thirty-five thousand, four hundred four".