2551405 has 8 divisors (see below), whose sum is σ = 3133152. Its totient is φ = 1993488.

The previous prime is 2551403. The next prime is 2551421. The reversal of 2551405 is 5041552.

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

It is a cyclic number.

It is not a de Polignac number, because 2551405 - 2¹ = 2551403 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551403) 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, 5719 + ... + 6148.

It is an arithmetic number, because the mean of its divisors is an integer number (391644).

2^2551405 is an apocalyptic number.

It is an amenable number.

2551405 is a deficient number, since it is larger than the sum of its proper divisors (581747).

2551405 is a wasteful number, since it uses less digits than its factorization.

2551405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11915.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2551405 is about 1597.3118042511. The cubic root of 2551405 is about 136.6448077936.

Adding to 2551405 its reverse (5041552), we get a palindrome (7592957).

The spelling of 2551405 in words is "two million, five hundred fifty-one thousand, four hundred five".