2521438 has 4 divisors (see below), whose sum is σ = 3782160. Its totient is φ = 1260718.

The previous prime is 2521429. The next prime is 2521451. The reversal of 2521438 is 8341252.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630358 + ... + 630361.

It is an arithmetic number, because the mean of its divisors is an integer number (945540).

2^2521438 is an apocalyptic number.

2521438 is a deficient number, since it is larger than the sum of its proper divisors (1260722).

2521438 is a wasteful number, since it uses less digits than its factorization.

2521438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260721.

The product of its digits is 1920, while the sum is 25.

The square root of 2521438 is about 1587.9036494700. The cubic root of 2521438 is about 136.1077217476.

It can be divided in two parts, 25214 and 38, that added together give a palindrome (25252).

The spelling of 2521438 in words is "two million, five hundred twenty-one thousand, four hundred thirty-eight".