161970440 has 32 divisors (see below), whose sum is σ = 383616000. Its totient is φ = 61377984.

The previous prime is 161970409. The next prime is 161970449. The reversal of 161970440 is 44079161.

It is a junction number, because it is equal to n+sod(n) for n = 161970397 and 161970406.

It is not an unprimeable number, because it can be changed into a prime (161970449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105800 + ... + 107319.

It is an arithmetic number, because the mean of its divisors is an integer number (11988000).

Almost surely, 2^161970440 is an apocalyptic number.

161970440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161970440 is an abundant number, since it is smaller than the sum of its proper divisors (221645560).

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

161970440 is a wasteful number, since it uses less digits than its factorization.

161970440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213149 (or 213145 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 161970440 is about 12726.7607819115. The cubic root of 161970440 is about 545.1030189903.

The spelling of 161970440 in words is "one hundred sixty-one million, nine hundred seventy thousand, four hundred forty".