6990457 has 4 divisors (see below), whose sum is σ = 6996736. Its totient is φ = 6984180.

The previous prime is 6990439. The next prime is 6990463. The reversal of 6990457 is 7540996.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6990457 - 2¹⁵ = 6957689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6990427) 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 3 ways as a sum of consecutive naturals, for example, 969 + ... + 3862.

It is an arithmetic number, because the mean of its divisors is an integer number (1749184).

Almost surely, 2^6990457 is an apocalyptic number.

It is an amenable number.

6990457 is a deficient number, since it is larger than the sum of its proper divisors (6279).

6990457 is a wasteful number, since it uses less digits than its factorization.

6990457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6278.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 6990457 is about 2643.9472385053. The cubic root of 6990457 is about 191.2061496858.

It can be divided in two parts, 6990 and 457, that added together give a palindrome (7447).

The spelling of 6990457 in words is "six million, nine hundred ninety thousand, four hundred fifty-seven".