2157790 has 16 divisors (see below), whose sum is σ = 3912480. Its totient is φ = 856800.

The previous prime is 2157787. The next prime is 2157797. The reversal of 2157790 is 977512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157797) 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, 796 + ... + 2224.

It is an arithmetic number, because the mean of its divisors is an integer number (244530).

2^2157790 is an apocalyptic number.

2157790 is a deficient number, since it is larger than the sum of its proper divisors (1754690).

2157790 is a wasteful number, since it uses less digits than its factorization.

2157790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 2157790 is about 1468.9417959878. The cubic root of 2157790 is about 129.2219802405.

The spelling of 2157790 in words is "two million, one hundred fifty-seven thousand, seven hundred ninety".