7944140 has 24 divisors (see below), whose sum is σ = 16873920. Its totient is φ = 3141248.

The previous prime is 7944133. The next prime is 7944143. The reversal of 7944140 is 414497.

7944140 = 426² + 427² + ... + 465².

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7944143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452 + ... + 4011.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^7944140 is an apocalyptic number.

It is an amenable number.

7944140 is an abundant number, since it is smaller than the sum of its proper divisors (8929780).

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

7944140 is a wasteful number, since it uses less digits than its factorization.

7944140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561 (or 4559 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 7944140 is about 2818.5350804984. The cubic root of 7944140 is about 199.5334123262.

The spelling of 7944140 in words is "seven million, nine hundred forty-four thousand, one hundred forty".