6991420 has 24 divisors (see below), whose sum is σ = 15546384. Its totient is φ = 2631936.

The previous prime is 6991417. The next prime is 6991427. The reversal of 6991420 is 241996.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991427) 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, 9942 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (647766).

Almost surely, 2^6991420 is an apocalyptic number.

It is an amenable number.

6991420 is an abundant number, since it is smaller than the sum of its proper divisors (8554964).

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

6991420 is a wasteful number, since it uses less digits than its factorization.

6991420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20589 (or 20587 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 6991420 is about 2644.1293463066. The cubic root of 6991420 is about 191.2149294202.

The spelling of 6991420 in words is "six million, nine hundred ninety-one thousand, four hundred twenty".