2251405 has 16 divisors (see below), whose sum is σ = 3064320. Its totient is φ = 1574208.

The previous prime is 2251397. The next prime is 2251411. The reversal of 2251405 is 5041522.

It is a cyclic number.

It is not a de Polignac number, because 2251405 - 2³ = 2251397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

2^2251405 is an apocalyptic number.

It is an amenable number.

2251405 is a deficient number, since it is larger than the sum of its proper divisors (812915).

2251405 is a wasteful number, since it uses less digits than its factorization.

2251405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2251405 is about 1500.4682602441. The cubic root of 2251405 is about 131.0643391585.

Adding to 2251405 its reverse (5041522), we get a palindrome (7292927).

The spelling of 2251405 in words is "two million, two hundred fifty-one thousand, four hundred five".