7944138 has 24 divisors (see below), whose sum is σ = 17374500. Its totient is φ = 2623104.

The previous prime is 7944133. The next prime is 7944143. The reversal of 7944138 is 8314497.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7944133) and next prime (7944143).

It can be written as a sum of positive squares in 2 ways, for example, as 7935489 + 8649 = 2817^2 + 93^2 .

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7944133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63 + ... + 3986.

Almost surely, 2^7944138 is an apocalyptic number.

7944138 is an abundant number, since it is smaller than the sum of its proper divisors (9430362).

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

7944138 is a wasteful number, since it uses less digits than its factorization.

7944138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4166 (or 4163 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 7944138 is about 2818.5347257041. The cubic root of 7944138 is about 199.5333955815.

The spelling of 7944138 in words is "seven million, nine hundred forty-four thousand, one hundred thirty-eight".