2157390 has 24 divisors (see below), whose sum is σ = 5609448. Its totient is φ = 575280.

The previous prime is 2157361. The next prime is 2157391. The reversal of 2157390 is 937512.

2157390 is a `hidden beast` number, since 2 + 1 + 573 + 90 = 666.

2157390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2157390² = 9308663224200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11896 + ... + 12075.

It is an arithmetic number, because the mean of its divisors is an integer number (233727).

2^2157390 is an apocalyptic number.

2157390 is an abundant number, since it is smaller than the sum of its proper divisors (3452058).

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

2157390 is a wasteful number, since it uses less digits than its factorization.

2157390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23984 (or 23981 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 2157390 is about 1468.8056372441. The cubic root of 2157390 is about 129.2139949120.

The spelling of 2157390 in words is "two million, one hundred fifty-seven thousand, three hundred ninety".