2131785 has 16 divisors (see below), whose sum is σ = 3790080. Its totient is φ = 1136880.

The previous prime is 2131771. The next prime is 2131793. The reversal of 2131785 is 5871312.

It is not a de Polignac number, because 2131785 - 2⁶ = 2131721 is a prime.

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, 7761 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (236880).

2^2131785 is an apocalyptic number.

It is an amenable number.

2131785 is a deficient number, since it is larger than the sum of its proper divisors (1658295).

2131785 is a wasteful number, since it uses less digits than its factorization.

2131785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15805 (or 15799 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2131785 is about 1460.0633547898. The cubic root of 2131785 is about 128.7007666724.

It can be divided in two parts, 2131 and 785, that added together give a square (2916 = 54²).

The spelling of 2131785 in words is "two million, one hundred thirty-one thousand, seven hundred eighty-five".