697238639 has 8 divisors (see below), whose sum is σ = 722337408. Its totient is φ = 672302880.

The previous prime is 697238609. The next prime is 697238669. The reversal of 697238639 is 936832796.

697238639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (697238609) and next prime (697238669).

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

It is a cyclic number.

It is not a de Polignac number, because 697238639 - 2²⁸ = 428803183 is a prime.

It is a super-3 number, since 3×697238639³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697238609) 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, 32012 + ... + 49185.

It is an arithmetic number, because the mean of its divisors is an integer number (90292176).

Almost surely, 2^697238639 is an apocalyptic number.

697238639 is a deficient number, since it is larger than the sum of its proper divisors (25098769).

697238639 is a wasteful number, since it uses less digits than its factorization.

697238639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81505.

The product of its digits is 2939328, while the sum is 53.

The square root of 697238639 is about 26405.2767264424. The cubic root of 697238639 is about 886.7349281464.

The spelling of 697238639 in words is "six hundred ninety-seven million, two hundred thirty-eight thousand, six hundred thirty-nine".