3161920 has 56 divisors (see below), whose sum is σ = 7744968. Its totient is φ = 1228800.

The previous prime is 3161897. The next prime is 3161953. The reversal of 3161920 is 291613.

It can be written as a sum of positive squares in 4 ways, for example, as 92416 + 3069504 = 304^2 + 1752^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3161891 and 3161900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13000 + ... + 13240.

It is an arithmetic number, because the mean of its divisors is an integer number (138303).

Almost surely, 2^3161920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3161920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3872484).

3161920 is an abundant number, since it is smaller than the sum of its proper divisors (4583048).

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

3161920 is a wasteful number, since it uses less digits than its factorization.

3161920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 3161920 is about 1778.1788436487. The cubic root of 3161920 is about 146.7743928488.

The spelling of 3161920 in words is "three million, one hundred sixty-one thousand, nine hundred twenty".