2490021 has 12 divisors (see below), whose sum is σ = 3730272. Its totient is φ = 1659852.

The previous prime is 2489999. The next prime is 2490023. The reversal of 2490021 is 1200942.

It is a de Polignac number, because none of the positive numbers 2^k-2490021 is a prime.

2490021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2489976 and 2490003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2490023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4881 + ... + 5366.

It is an arithmetic number, because the mean of its divisors is an integer number (310856).

2^2490021 is an apocalyptic number.

It is an amenable number.

2490021 is a deficient number, since it is larger than the sum of its proper divisors (1240251).

2490021 is an equidigital number, since it uses as much as digits as its factorization.

2490021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10262 (or 10250 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2490021 is about 1577.9800378966. The cubic root of 2490021 is about 135.5400588703.

Adding to 2490021 its reverse (1200942), we get a palindrome (3690963).

The spelling of 2490021 in words is "two million, four hundred ninety thousand, twenty-one".