6969640 has 16 divisors (see below), whose sum is σ = 15681780. Its totient is φ = 2787840.

The previous prime is 6969629. The next prime is 6969647. The reversal of 6969640 is 469696.

It can be written as a sum of positive squares in 2 ways, for example, as 6937956 + 31684 = 2634^2 + 178^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 174241 = 6969640 / (6 + 9 + 6 + 9 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 6969593 and 6969602.

It is not an unprimeable number, because it can be changed into a prime (6969647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87081 + ... + 87160.

Almost surely, 2^6969640 is an apocalyptic number.

It is an amenable number.

6969640 is an abundant number, since it is smaller than the sum of its proper divisors (8712140).

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

6969640 is a wasteful number, since it uses less digits than its factorization.

6969640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174252 (or 174248 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 6969640 is about 2640.0075757467. The cubic root of 6969640 is about 191.0161622974.

Subtracting from 6969640 its sum of digits (40), we obtain a square (6969600 = 2640²).

The spelling of 6969640 in words is "six million, nine hundred sixty-nine thousand, six hundred forty".