161223240 has 64 divisors (see below), whose sum is σ = 512127360. Its totient is φ = 40463360.

The previous prime is 161223221. The next prime is 161223247. The reversal of 161223240 is 42322161.

It is not an unprimeable number, because it can be changed into a prime (161223247) 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, 37476 + ... + 41555.

It is an arithmetic number, because the mean of its divisors is an integer number (8001990).

Almost surely, 2^161223240 is an apocalyptic number.

161223240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161223240 is an abundant number, since it is smaller than the sum of its proper divisors (350904120).

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

161223240 is a wasteful number, since it uses less digits than its factorization.

161223240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79062 (or 79058 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 161223240 is about 12697.3713815104. The cubic root of 161223240 is about 544.2635059193.

The spelling of 161223240 in words is "one hundred sixty-one million, two hundred twenty-three thousand, two hundred forty".