7240639 has 16 divisors (see below), whose sum is σ = 8697856. Its totient is φ = 5896800.

The previous prime is 7240637. The next prime is 7240643. The reversal of 7240639 is 9360427.

It is not a de Polignac number, because 7240639 - 2¹ = 7240637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 7240639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7240631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12964 + ... + 13510.

It is an arithmetic number, because the mean of its divisors is an integer number (543616).

Almost surely, 2^7240639 is an apocalyptic number.

7240639 is a deficient number, since it is larger than the sum of its proper divisors (1457217).

7240639 is a wasteful number, since it uses less digits than its factorization.

7240639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 7240639 is about 2690.8435480347. The cubic root of 7240639 is about 193.4604966687.

The spelling of 7240639 in words is "seven million, two hundred forty thousand, six hundred thirty-nine".