6989431 has 4 divisors (see below), whose sum is σ = 7400592. Its totient is φ = 6578272.

The previous prime is 6989429. The next prime is 6989443. The reversal of 6989431 is 1349896.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6989431 - 2¹ = 6989429 is a prime.

It is a super-2 number, since 2×6989431² = 97704291407522, which contains 22 as substring.

It is a Duffinian number.

6989431 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6989461) 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, 205555 + ... + 205588.

It is an arithmetic number, because the mean of its divisors is an integer number (1850148).

Almost surely, 2^6989431 is an apocalyptic number.

6989431 is a deficient number, since it is larger than the sum of its proper divisors (411161).

6989431 is a wasteful number, since it uses less digits than its factorization.

6989431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411160.

The product of its digits is 46656, while the sum is 40.

The square root of 6989431 is about 2643.7532033078. The cubic root of 6989431 is about 191.1967946890.

The spelling of 6989431 in words is "six million, nine hundred eighty-nine thousand, four hundred thirty-one".