6890440 has 32 divisors (see below), whose sum is σ = 16417080. Its totient is φ = 2593792.

The previous prime is 6890437. The next prime is 6890447. The reversal of 6890440 is 440986.

It can be written as a sum of positive squares in 4 ways, for example, as 6728836 + 161604 = 2594^2 + 402^2 .

It is not an unprimeable number, because it can be changed into a prime (6890447) 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, 4387 + ... + 5746.

Almost surely, 2^6890440 is an apocalyptic number.

It is an amenable number.

6890440 is an abundant number, since it is smaller than the sum of its proper divisors (9526640).

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

6890440 is a wasteful number, since it uses less digits than its factorization.

6890440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161 (or 10157 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6890440 is about 2624.9647616682. The cubic root of 6890440 is about 190.2898622730.

The spelling of 6890440 in words is "six million, eight hundred ninety thousand, four hundred forty".