689977401 has 4 divisors (see below), whose sum is σ = 919969872. Its totient is φ = 459984932.

The previous prime is 689977399. The next prime is 689977427. The reversal of 689977401 is 104779986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689977401 - 2¹ = 689977399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689977471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114996231 + ... + 114996236.

It is an arithmetic number, because the mean of its divisors is an integer number (229992468).

Almost surely, 2^689977401 is an apocalyptic number.

It is an amenable number.

689977401 is a deficient number, since it is larger than the sum of its proper divisors (229992471).

689977401 is a wasteful number, since it uses less digits than its factorization.

689977401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229992470.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 689977401 is about 26267.4209049918. The cubic root of 689977401 is about 883.6459449212.

The spelling of 689977401 in words is "six hundred eighty-nine million, nine hundred seventy-seven thousand, four hundred one".