7940240 has 80 divisors (see below), whose sum is σ = 23034240. Its totient is φ = 2472960.

The previous prime is 7940239. The next prime is 7940243. The reversal of 7940240 is 420497.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×7940240² = 126094822515200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7940243) 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, 5516 + ... + 6804.

It is an arithmetic number, because the mean of its divisors is an integer number (287928).

Almost surely, 2^7940240 is an apocalyptic number.

7940240 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 7940240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11517120).

7940240 is an abundant number, since it is smaller than the sum of its proper divisors (15094000).

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

7940240 is a wasteful number, since it uses less digits than its factorization.

7940240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 7940240 is about 2817.8431468057. The cubic root of 7940240 is about 199.5007548081.

The spelling of 7940240 in words is "seven million, nine hundred forty thousand, two hundred forty".