6990506 has 4 divisors (see below), whose sum is σ = 10485762. Its totient is φ = 3495252.

The previous prime is 6990493. The next prime is 6990517. The reversal of 6990506 is 6050996.

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

It can be written as a sum of positive squares in only one way, i.e., 6974881 + 15625 = 2641^2 + 125^2 .

It is a Curzon number.

It is a plaindrome in base 4 and base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1747625 + ... + 1747628.

Almost surely, 2^6990506 is an apocalyptic number.

6990506 is a deficient number, since it is larger than the sum of its proper divisors (3495256).

6990506 is a wasteful number, since it uses less digits than its factorization.

6990506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495255.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 6990506 is about 2643.9565049373. The cubic root of 6990506 is about 191.2065964415.

The spelling of 6990506 in words is "six million, nine hundred ninety thousand, five hundred six".