2251404 has 18 divisors (see below), whose sum is σ = 5691140. Its totient is φ = 750456.

The previous prime is 2251397. The next prime is 2251411. The reversal of 2251404 is 4041522.

It is an interprime number because it is at equal distance from previous prime (2251397) and next prime (2251411).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31234 + ... + 31305.

2^2251404 is an apocalyptic number.

It is an amenable number.

2251404 is an abundant number, since it is smaller than the sum of its proper divisors (3439736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2251404 is a wasteful number, since it uses less digits than its factorization.

2251404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62549 (or 62544 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2251404 is about 1500.4679270148. The cubic root of 2251404 is about 131.0643197537.

Adding to 2251404 its reverse (4041522), we get a palindrome (6292926).

The spelling of 2251404 in words is "two million, two hundred fifty-one thousand, four hundred four".