161712440 has 32 divisors (see below), whose sum is σ = 368984160. Its totient is φ = 63772800.

The previous prime is 161712437. The next prime is 161712443. The reversal of 161712440 is 44217161.

It is an interprime number because it is at equal distance from previous prime (161712437) and next prime (161712443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161712443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25631 + ... + 31310.

It is an arithmetic number, because the mean of its divisors is an integer number (11530755).

Almost surely, 2^161712440 is an apocalyptic number.

161712440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161712440 is an abundant number, since it is smaller than the sum of its proper divisors (207271720).

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

161712440 is a wasteful number, since it uses less digits than its factorization.

161712440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57023 (or 57019 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 161712440 is about 12716.6206202749. The cubic root of 161712440 is about 544.8134366904.

The spelling of 161712440 in words is "one hundred sixty-one million, seven hundred twelve thousand, four hundred forty".