7499940 has 72 divisors (see below), whose sum is σ = 24437952. Its totient is φ = 1713600.

The previous prime is 7499939. The next prime is 7499969. The reversal of 7499940 is 499947.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 7499892 and 7499901.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1665 + ... + 4215.

It is an arithmetic number, because the mean of its divisors is an integer number (339416).

Almost surely, 2^7499940 is an apocalyptic number.

7499940 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7499940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12218976).

7499940 is an abundant number, since it is smaller than the sum of its proper divisors (16938012).

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

7499940 is a wasteful number, since it uses less digits than its factorization.

7499940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577 (or 2568 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 7499940 is about 2738.6018330528. The cubic root of 7499940 is about 195.7428600747.

The spelling of 7499940 in words is "seven million, four hundred ninety-nine thousand, nine hundred forty".