690659423 has 4 divisors (see below), whose sum is σ = 694651848. Its totient is φ = 686667000.

The previous prime is 690659399. The next prime is 690659441. The reversal of 690659423 is 324956096.

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

It is a cyclic number.

It is not a de Polignac number, because 690659423 - 2¹⁰ = 690658399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690652423) 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, 1995953 + ... + 1996298.

It is an arithmetic number, because the mean of its divisors is an integer number (173662962).

Almost surely, 2^690659423 is an apocalyptic number.

690659423 is a deficient number, since it is larger than the sum of its proper divisors (3992425).

690659423 is a wasteful number, since it uses less digits than its factorization.

690659423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992424.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 690659423 is about 26280.3999779303. The cubic root of 690659423 is about 883.9370015608.

The spelling of 690659423 in words is "six hundred ninety million, six hundred fifty-nine thousand, four hundred twenty-three".