2145290 has 32 divisors (see below), whose sum is σ = 4648320. Its totient is φ = 696384.

The previous prime is 2145289. The next prime is 2145307. The reversal of 2145290 is 925412.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

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, 524 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (145260).

2^2145290 is an apocalyptic number.

2145290 is an abundant number, since it is smaller than the sum of its proper divisors (2503030).

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

2145290 is a wasteful number, since it uses less digits than its factorization.

2145290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2145290 is about 1464.6808526092. The cubic root of 2145290 is about 128.9719707546.

The spelling of 2145290 in words is "two million, one hundred forty-five thousand, two hundred ninety".