2403997 has 4 divisors (see below), whose sum is σ = 2410720. Its totient is φ = 2397276.

The previous prime is 2403977. The next prime is 2404009. The reversal of 2403997 is 7993042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7993042 = 2 ⋅3996521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2403997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2403977) 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, 2793 + ... + 3550.

It is an arithmetic number, because the mean of its divisors is an integer number (602680).

2^2403997 is an apocalyptic number.

It is an amenable number.

2403997 is a deficient number, since it is larger than the sum of its proper divisors (6723).

2403997 is an equidigital number, since it uses as much as digits as its factorization.

2403997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 2403997 is about 1550.4828280249. The cubic root of 2403997 is about 133.9608744463.

The spelling of 2403997 in words is "two million, four hundred three thousand, nine hundred ninety-seven".