6990145 has 8 divisors (see below), whose sum is σ = 8881704. Its totient is φ = 5263104.

The previous prime is 6990107. The next prime is 6990161. The reversal of 6990145 is 5410996.

It can be written as a sum of positive squares in 4 ways, for example, as 3519376 + 3470769 = 1876^2 + 1863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6990145 - 2⁷ = 6990017 is a prime.

It is a Duffinian number.

6990145 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6990145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41034 + ... + 41203.

It is an arithmetic number, because the mean of its divisors is an integer number (1110213).

Almost surely, 2^6990145 is an apocalyptic number.

It is an amenable number.

6990145 is a deficient number, since it is larger than the sum of its proper divisors (1891559).

6990145 is a wasteful number, since it uses less digits than its factorization.

6990145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82259.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 6990145 is about 2643.8882351567. Note that the first 3 decimals coincide. The cubic root of 6990145 is about 191.2033049883.

The spelling of 6990145 in words is "six million, nine hundred ninety thousand, one hundred forty-five".