2158003 has 8 divisors (see below), whose sum is σ = 2263040. Its totient is φ = 2055240.

The previous prime is 2157989. The next prime is 2158019. The reversal of 2158003 is 3008512.

It is a happy number.

2158003 is a nontrivial binomial coefficient, being equal to C(2078, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2158003 - 2¹⁷ = 2026931 is a prime.

It is a Duffinian number.

2158003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2158033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1558 + ... + 2596.

It is an arithmetic number, because the mean of its divisors is an integer number (282880).

2^2158003 is an apocalyptic number.

2158003 is the 2077-th triangular number and also the 1039-th hexagonal number.

2158003 is the 693-rd centered nonagonal number.

2158003 is a deficient number, since it is larger than the sum of its proper divisors (105037).

2158003 is a wasteful number, since it uses less digits than its factorization.

2158003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2158003 is about 1469.0142953695. The cubic root of 2158003 is about 129.2262320254.

The spelling of 2158003 in words is "two million, one hundred fifty-eight thousand, three".