2538621 has 24 divisors (see below), whose sum is σ = 3937024. Its totient is φ = 1632960.

The previous prime is 2538619. The next prime is 2538623. The reversal of 2538621 is 1268352.

2538621 is a `hidden beast` number, since 2 + 5 + 38 + 621 = 666.

It is an interprime number because it is at equal distance from previous prime (2538619) and next prime (2538623).

It is not a de Polignac number, because 2538621 - 2¹ = 2538619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹² + 5⁸ + 3³ + 8² + 6⁶ + 2²¹ + 1 .

It is a Duffinian number.

It is a Curzon number.

2538621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2538623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7365 + ... + 7701.

2^2538621 is an apocalyptic number.

It is an amenable number.

2538621 is a deficient number, since it is larger than the sum of its proper divisors (1398403).

2538621 is an equidigital number, since it uses as much as digits as its factorization.

2538621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 371 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2538621 is about 1593.3050555371. The cubic root of 2538621 is about 136.4162026429.

The spelling of 2538621 in words is "two million, five hundred thirty-eight thousand, six hundred twenty-one".