2157345 has 24 divisors (see below), whose sum is σ = 3773952. Its totient is φ = 1140000.

The previous prime is 2157343. The next prime is 2157361. The reversal of 2157345 is 5437512.

It is a happy number.

It is not a de Polignac number, because 2157345 - 2¹ = 2157343 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2157341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8470 + ... + 8720.

It is an arithmetic number, because the mean of its divisors is an integer number (157248).

2^2157345 is an apocalyptic number.

It is an amenable number.

2157345 is a deficient number, since it is larger than the sum of its proper divisors (1616607).

2157345 is a wasteful number, since it uses less digits than its factorization.

2157345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 450 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 2157345 is about 1468.7903185955. The cubic root of 2157345 is about 129.2130965008.

The spelling of 2157345 in words is "two million, one hundred fifty-seven thousand, three hundred forty-five".