6929991 has 6 divisors (see below), whose sum is σ = 10010000. Its totient is φ = 4619988.

The previous prime is 6929987. The next prime is 6930023. The reversal of 6929991 is 1999296.

It is a happy number.

It is not a de Polignac number, because 6929991 - 2² = 6929987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6929921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 384991 + ... + 385008.

Almost surely, 2^6929991 is an apocalyptic number.

6929991 is a deficient number, since it is larger than the sum of its proper divisors (3080009).

6929991 is a wasteful number, since it uses less digits than its factorization.

6929991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770005 (or 770002 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 6929991 is about 2632.4876068084. The cubic root of 6929991 is about 190.6532546491.

The spelling of 6929991 in words is "six million, nine hundred twenty-nine thousand, nine hundred ninety-one".