161490390 has 32 divisors (see below), whose sum is σ = 397033056. Its totient is φ = 42013440.

The previous prime is 161490359. The next prime is 161490397. The reversal of 161490390 is 93094161.

161490390 is digitally balanced in base 3, because in such base 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 (161490397) 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, 64417 + ... + 66876.

It is an arithmetic number, because the mean of its divisors is an integer number (12407283).

Almost surely, 2^161490390 is an apocalyptic number.

161490390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161490390 is an abundant number, since it is smaller than the sum of its proper divisors (235542666).

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

161490390 is a wasteful number, since it uses less digits than its factorization.

161490390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131344.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 161490390 is about 12707.8869211211. The cubic root of 161490390 is about 544.5639583835.

The spelling of 161490390 in words is "one hundred sixty-one million, four hundred ninety thousand, three hundred ninety".