2553639 has 8 divisors (see below), whose sum is σ = 3714432. Its totient is φ = 1547640.

The previous prime is 2553637. The next prime is 2553647. The reversal of 2553639 is 9363552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2553639 - 2¹ = 2553637 is a prime.

It is a super-3 number, since 3×2553639³ = 49957392433333368357, which contains 333 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 77383 = 2553639 / (2 + 5 + 5 + 3 + 6 + 3 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2553631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38659 + ... + 38724.

It is an arithmetic number, because the mean of its divisors is an integer number (464304).

2^2553639 is an apocalyptic number.

2553639 is a deficient number, since it is larger than the sum of its proper divisors (1160793).

2553639 is a wasteful number, since it uses less digits than its factorization.

2553639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77397.

The product of its digits is 24300, while the sum is 33.

The square root of 2553639 is about 1598.0109511515. The cubic root of 2553639 is about 136.6846780413.

The spelling of 2553639 in words is "two million, five hundred fifty-three thousand, six hundred thirty-nine".