6981220 has 24 divisors (see below), whose sum is σ = 15523704. Its totient is φ = 2628096.

The previous prime is 6981211. The next prime is 6981229. The reversal of 6981220 is 221896.

6981220 = T₂₅₀ + T₂₅₁ + ... + T₃₈₅.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6981211) and next prime (6981229).

It can be written as a sum of positive squares in 4 ways, for example, as 1999396 + 4981824 = 1414^2 + 2232^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6981229) 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, 9927 + ... + 10606.

It is an arithmetic number, because the mean of its divisors is an integer number (646821).

Almost surely, 2^6981220 is an apocalyptic number.

It is an amenable number.

6981220 is an abundant number, since it is smaller than the sum of its proper divisors (8542484).

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

6981220 is a wasteful number, since it uses less digits than its factorization.

6981220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20559 (or 20557 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 6981220 is about 2642.1998410416. The cubic root of 6981220 is about 191.1218943598.

The spelling of 6981220 in words is "six million, nine hundred eighty-one thousand, two hundred twenty".