161403918 has 32 divisors (see below), whose sum is σ = 358858752. Its totient is φ = 48060000.

The previous prime is 161403911. The next prime is 161403943. The reversal of 161403918 is 819304161.

161403918 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161403911) 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, 30958 + ... + 35793.

It is an arithmetic number, because the mean of its divisors is an integer number (11214336).

Almost surely, 2^161403918 is an apocalyptic number.

161403918 is an abundant number, since it is smaller than the sum of its proper divisors (197454834).

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

161403918 is a wasteful number, since it uses less digits than its factorization.

161403918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66800.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161403918 is about 12704.4841689854. The cubic root of 161403918 is about 544.4667432242.

The spelling of 161403918 in words is "one hundred sixty-one million, four hundred three thousand, nine hundred eighteen".