7142640 has 40 divisors (see below), whose sum is σ = 22142928. Its totient is φ = 1904640.

The previous prime is 7142633. The next prime is 7142659. The reversal of 7142640 is 462417.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 7142640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14641 + ... + 15120.

Almost surely, 2^7142640 is an apocalyptic number.

It is an amenable number.

7142640 is an abundant number, since it is smaller than the sum of its proper divisors (15000288).

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

7142640 is a wasteful number, since it uses less digits than its factorization.

7142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29777 (or 29771 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 7142640 is about 2672.5717951067. The cubic root of 7142640 is about 192.5837270008.

The spelling of 7142640 in words is "seven million, one hundred forty-two thousand, six hundred forty".