161423490 has 32 divisors (see below), whose sum is σ = 388676736. Its totient is φ = 42906240.

The previous prime is 161423473. The next prime is 161423491. The reversal of 161423490 is 94324161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161423491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 795 + ... + 17985.

It is an arithmetic number, because the mean of its divisors is an integer number (12146148).

Almost surely, 2^161423490 is an apocalyptic number.

161423490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161423490 is an abundant number, since it is smaller than the sum of its proper divisors (227253246).

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

161423490 is a wasteful number, since it uses less digits than its factorization.

161423490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17514.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 161423490 is about 12705.2544248433. The cubic root of 161423490 is about 544.4887498614.

The spelling of 161423490 in words is "one hundred sixty-one million, four hundred twenty-three thousand, four hundred ninety".