7811940 has 24 divisors (see below), whose sum is σ = 21873600. Its totient is φ = 2083168.

The previous prime is 7811911. The next prime is 7811941. The reversal of 7811940 is 491187.

It is a super-2 number, since 2×7811940² = 122052813127200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 7811898 and 7811907.

It is not an unprimeable number, because it can be changed into a prime (7811941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65040 + ... + 65159.

It is an arithmetic number, because the mean of its divisors is an integer number (911400).

Almost surely, 2^7811940 is an apocalyptic number.

It is an amenable number.

7811940 is an abundant number, since it is smaller than the sum of its proper divisors (14061660).

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

7811940 is a wasteful number, since it uses less digits than its factorization.

7811940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130211 (or 130209 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 7811940 is about 2794.9847942341. The cubic root of 7811940 is about 198.4203903449.

The spelling of 7811940 in words is "seven million, eight hundred eleven thousand, nine hundred forty".