690844389 has 8 divisors (see below), whose sum is σ = 969606240. Its totient is φ = 436322736.

The previous prime is 690844373. The next prime is 690844391. The reversal of 690844389 is 983448096.

It is a happy number.

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

It is not a de Polignac number, because 690844389 - 2⁴ = 690844373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690844339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6059982 + ... + 6060095.

It is an arithmetic number, because the mean of its divisors is an integer number (121200780).

Almost surely, 2^690844389 is an apocalyptic number.

It is an amenable number.

690844389 is a deficient number, since it is larger than the sum of its proper divisors (278761851).

690844389 is a wasteful number, since it uses less digits than its factorization.

690844389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12120099.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 690844389 is about 26283.9188288200. The cubic root of 690844389 is about 884.0159037870.

The spelling of 690844389 in words is "six hundred ninety million, eight hundred forty-four thousand, three hundred eighty-nine".