2131690 has 16 divisors (see below), whose sum is σ = 4186080. Its totient is φ = 775120.

The previous prime is 2131687. The next prime is 2131691. The reversal of 2131690 is 961312.

It is a super-2 number, since 2×2131690² = 9088204512200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (2131691) 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, 9580 + ... + 9799.

It is an arithmetic number, because the mean of its divisors is an integer number (261630).

2^2131690 is an apocalyptic number.

2131690 is a deficient number, since it is larger than the sum of its proper divisors (2054390).

2131690 is a wasteful number, since it uses less digits than its factorization.

2131690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19397.

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

The square root of 2131690 is about 1460.0308215925. The cubic root of 2131690 is about 128.6988548545.

The spelling of 2131690 in words is "two million, one hundred thirty-one thousand, six hundred ninety".