161490 has 32 divisors (see below), whose sum is σ = 443520. Its totient is φ = 36864.

The previous prime is 161471. The next prime is 161503. The reversal of 161490 is 94161.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161490.

It is an unprimeable number.

161490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175 + ... + 594.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2¹⁶¹⁴⁹⁰ is an apocalyptic number.

161490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161490 is an abundant number, since it is smaller than the sum of its proper divisors (282030).

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

161490 is a wasteful number, since it uses less digits than its factorization.

161490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 161490 is about 401.8581839406. The cubic root of 161490 is about 54.4563520008.

The spelling of 161490 in words is "one hundred sixty-one thousand, four hundred ninety".