7402640 has 40 divisors (see below), whose sum is σ = 19671360. Its totient is φ = 2537856.

The previous prime is 7402631. The next prime is 7402649. The reversal of 7402640 is 462047.

It is an interprime number because it is at equal distance from previous prime (7402631) and next prime (7402649).

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

It is not an unprimeable number, because it can be changed into a prime (7402649) 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, 6050 + ... + 7169.

It is an arithmetic number, because the mean of its divisors is an integer number (491784).

Almost surely, 2^7402640 is an apocalyptic number.

7402640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7402640 is an abundant number, since it is smaller than the sum of its proper divisors (12268720).

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

7402640 is a wasteful number, since it uses less digits than its factorization.

7402640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13239 (or 13233 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 7402640 is about 2720.7793001271. The cubic root of 7402640 is about 194.8926869544.

Adding to 7402640 its reverse (462047), we get a palindrome (7864687).

The spelling of 7402640 in words is "seven million, four hundred two thousand, six hundred forty".