2155444 has 12 divisors (see below), whose sum is σ = 3802624. Its totient is φ = 1068984.

The previous prime is 2155429. The next prime is 2155451. The reversal of 2155444 is 4445512.

It is a happy number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614 + ... + 2629.

2^2155444 is an apocalyptic number.

It is an amenable number.

2155444 is a deficient number, since it is larger than the sum of its proper divisors (1647180).

2155444 is a wasteful number, since it uses less digits than its factorization.

2155444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4374 (or 4372 counting only the distinct ones).

The product of its digits is 3200, while the sum is 25.

The square root of 2155444 is about 1468.1430448018. The cubic root of 2155444 is about 129.1751322004.

The spelling of 2155444 in words is "two million, one hundred fifty-five thousand, four hundred forty-four".