7974640 has 40 divisors (see below), whose sum is σ = 18780048. Its totient is φ = 3148800.

The previous prime is 7974613. The next prime is 7974641. The reversal of 7974640 is 464797.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 7974640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7974641) 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, 6040 + ... + 7240.

Almost surely, 2^7974640 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 7974640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9390024).

7974640 is an abundant number, since it is smaller than the sum of its proper divisors (10805408).

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

7974640 is a wasteful number, since it uses less digits than its factorization.

7974640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 7974640 is about 2823.9405092884. The cubic root of 7974640 is about 199.7884429637.

The spelling of 7974640 in words is "seven million, nine hundred seventy-four thousand, six hundred forty".