7440390 has 64 divisors (see below), whose sum is σ = 21021120. Its totient is φ = 1866240.

The previous prime is 7440383. The next prime is 7440397. The reversal of 7440390 is 930447.

It is an interprime number because it is at equal distance from previous prime (7440383) and next prime (7440397).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7440397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3780 + ... + 5400.

It is an arithmetic number, because the mean of its divisors is an integer number (328455).

Almost surely, 2^7440390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7440390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10510560).

7440390 is an abundant number, since it is smaller than the sum of its proper divisors (13580730).

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

7440390 is a wasteful number, since it uses less digits than its factorization.

7440390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 7440390 is about 2727.7078289289. The cubic root of 7440390 is about 195.2234125763.

The spelling of 7440390 in words is "seven million, four hundred forty thousand, three hundred ninety".