2497921 has 4 divisors (see below), whose sum is σ = 2516292. Its totient is φ = 2479552.

The previous prime is 2497903. The next prime is 2497927. The reversal of 2497921 is 1297942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1297942 = 2 ⋅648971.

It can be written as a sum of positive squares in 2 ways, for example, as 1527696 + 970225 = 1236^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2497921 - 2¹⁹ = 1973633 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2497927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8980 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (629073).

2^2497921 is an apocalyptic number.

It is an amenable number.

2497921 is a deficient number, since it is larger than the sum of its proper divisors (18371).

2497921 is a wasteful number, since it uses less digits than its factorization.

2497921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18370.

The product of its digits is 9072, while the sum is 34.

The square root of 2497921 is about 1580.4812558205. The cubic root of 2497921 is about 135.6832485680.

The spelling of 2497921 in words is "two million, four hundred ninety-seven thousand, nine hundred twenty-one".