690939853 has 4 divisors (see below), whose sum is σ = 703976508. Its totient is φ = 677903200.

The previous prime is 690939839. The next prime is 690939859. The reversal of 690939853 is 358939096.

It is a happy number.

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 318372649 + 372567204 = 17843^2 + 19302^2 .

It is a cyclic number.

It is not a de Polignac number, because 690939853 - 2⁹ = 690939341 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 690939853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690939859) 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, 6518248 + ... + 6518353.

It is an arithmetic number, because the mean of its divisors is an integer number (175994127).

Almost surely, 2^690939853 is an apocalyptic number.

It is an amenable number.

690939853 is a deficient number, since it is larger than the sum of its proper divisors (13036655).

690939853 is a wasteful number, since it uses less digits than its factorization.

690939853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13036654.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 690939853 is about 26285.7347814361. The cubic root of 690939853 is about 884.0566210158.

The spelling of 690939853 in words is "six hundred ninety million, nine hundred thirty-nine thousand, eight hundred fifty-three".