2157903 has 24 divisors (see below), whose sum is σ = 3459456. Its totient is φ = 1285200.

The previous prime is 2157901. The next prime is 2157907. The reversal of 2157903 is 3097512.

It is not a de Polignac number, because 2157903 - 2¹ = 2157901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157901) 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, 6876 + ... + 7182.

It is an arithmetic number, because the mean of its divisors is an integer number (144144).

2^2157903 is an apocalyptic number.

2157903 is a deficient number, since it is larger than the sum of its proper divisors (1301553).

2157903 is a wasteful number, since it uses less digits than its factorization.

2157903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 392 counting only the distinct ones).

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

The square root of 2157903 is about 1468.9802585467. The cubic root of 2157903 is about 129.2242359171.

It can be divided in two parts, 215 and 7903, that added together give a palindrome (8118).

The spelling of 2157903 in words is "two million, one hundred fifty-seven thousand, nine hundred three".