6989945 has 4 divisors (see below), whose sum is σ = 8387940. Its totient is φ = 5591952.

The previous prime is 6989933. The next prime is 6989947. The reversal of 6989945 is 5499896.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 2393209 = 2144^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989945 - 2¹⁶ = 6924409 is a prime.

It is a super-2 number, since 2×6989945² = 97718662206050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6989893 and 6989902.

It is not an unprimeable number, because it can be changed into a prime (6989947) 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, 698990 + ... + 698999.

It is an arithmetic number, because the mean of its divisors is an integer number (2096985).

Almost surely, 2^6989945 is an apocalyptic number.

It is an amenable number.

6989945 is a deficient number, since it is larger than the sum of its proper divisors (1397995).

6989945 is a wasteful number, since it uses less digits than its factorization.

6989945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397994.

The product of its digits is 699840, while the sum is 50.

The square root of 6989945 is about 2643.8504118047. The cubic root of 6989945 is about 191.2014814198.

The spelling of 6989945 in words is "six million, nine hundred eighty-nine thousand, nine hundred forty-five".