7840380 has 48 divisors (see below), whose sum is σ = 22125600. Its totient is φ = 2074368.

The previous prime is 7840367. The next prime is 7840381. The reversal of 7840380 is 830487.

It is a super-2 number, since 2×7840380² = 122943117088800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7840381) 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, 8502 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (460950).

Almost surely, 2^7840380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7840380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11062800).

7840380 is an abundant number, since it is smaller than the sum of its proper divisors (14285220).

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

7840380 is a wasteful number, since it uses less digits than its factorization.

7840380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 7840380 is about 2800.0678563206. The cubic root of 7840380 is about 198.6608872293.

The spelling of 7840380 in words is "seven million, eight hundred forty thousand, three hundred eighty".