2139444 has 36 divisors (see below), whose sum is σ = 5494944. Its totient is φ = 701712.

The previous prime is 2139427. The next prime is 2139461. The reversal of 2139444 is 4449312.

2139444 is a `hidden beast` number, since 213 + 9 + 444 = 666.

2139444 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2139427) and next prime (2139461).

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1969 + ... + 2855.

2^2139444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2139444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2747472).

2139444 is an abundant number, since it is smaller than the sum of its proper divisors (3355500).

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

2139444 is a wasteful number, since it uses less digits than its factorization.

2139444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 959 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2139444 is about 1462.6838345999. The cubic root of 2139444 is about 128.8547129408.

The spelling of 2139444 in words is "two million, one hundred thirty-nine thousand, four hundred forty-four".