7398840 has 32 divisors (see below), whose sum is σ = 22196880. Its totient is φ = 1972992.

The previous prime is 7398829. The next prime is 7398883. The reversal of 7398840 is 488937.

7398840 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 30709 + ... + 30948.

Almost surely, 2^7398840 is an apocalyptic number.

It is an amenable number.

7398840 is an abundant number, since it is smaller than the sum of its proper divisors (14798040).

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

7398840 is a wasteful number, since it uses less digits than its factorization.

7398840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61671 (or 61667 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 7398840 is about 2720.0808811504. The cubic root of 7398840 is about 194.8593331343.

Subtracting from 7398840 its reverse (488937), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 7398840 in words is "seven million, three hundred ninety-eight thousand, eight hundred forty".