2157603 has 16 divisors (see below), whose sum is σ = 3317760. Its totient is φ = 1221696.

The previous prime is 2157587. The next prime is 2157641. The reversal of 2157603 is 3067512.

It is not a de Polignac number, because 2157603 - 2⁴ = 2157587 is a prime.

2157603 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2263 + ... + 3071.

It is an arithmetic number, because the mean of its divisors is an integer number (207360).

2^2157603 is an apocalyptic number.

2157603 is a deficient number, since it is larger than the sum of its proper divisors (1160157).

2157603 is a wasteful number, since it uses less digits than its factorization.

2157603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 2157603 is about 1468.8781433461. The cubic root of 2157603 is about 129.2182472223.

Subtracting 2157603 from its reverse (3067512), we obtain a palindrome (909909).

The spelling of 2157603 in words is "two million, one hundred fifty-seven thousand, six hundred three".