161822340 has 48 divisors (see below), whose sum is σ = 503448960. Its totient is φ = 43152480.

The previous prime is 161822333. The next prime is 161822357. The reversal of 161822340 is 43228161.

161822340 is a `hidden beast` number, since 1 + 618 + 2 + 2 + 3 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149296 + ... + 150375.

It is an arithmetic number, because the mean of its divisors is an integer number (10488520).

Almost surely, 2^161822340 is an apocalyptic number.

161822340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161822340 is an abundant number, since it is smaller than the sum of its proper divisors (341626620).

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

161822340 is a wasteful number, since it uses less digits than its factorization.

161822340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299689 (or 299681 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 161822340 is about 12720.9410029290. The cubic root of 161822340 is about 544.9368273999.

The spelling of 161822340 in words is "one hundred sixty-one million, eight hundred twenty-two thousand, three hundred forty".