7409920 has 72 divisors (see below), whose sum is σ = 20309184. Its totient is φ = 2537472.

The previous prime is 7409917. The next prime is 7409921. The reversal of 7409920 is 299047.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (7409921) 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, 8547 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (282072).

Almost surely, 2^7409920 is an apocalyptic number.

7409920 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 7409920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10154592).

7409920 is an abundant number, since it is smaller than the sum of its proper divisors (12899264).

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

7409920 is an equidigital number, since it uses as much as digits as its factorization.

7409920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 7409920 is about 2722.1168233564. The cubic root of 7409920 is about 194.9565539852.

The spelling of 7409920 in words is "seven million, four hundred nine thousand, nine hundred twenty".