684623437 has 4 divisors (see below), whose sum is σ = 706708096. Its totient is φ = 662538780.

The previous prime is 684623413. The next prime is 684623461. The reversal of 684623437 is 734326486.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 734326486 = 2 ⋅367163243.

It is an interprime number because it is at equal distance from previous prime (684623413) and next prime (684623461).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684623437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684623393 and 684623402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684623477) 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, 11042283 + ... + 11042344.

It is an arithmetic number, because the mean of its divisors is an integer number (176677024).

Almost surely, 2^684623437 is an apocalyptic number.

It is an amenable number.

684623437 is a deficient number, since it is larger than the sum of its proper divisors (22084659).

684623437 is a wasteful number, since it uses less digits than its factorization.

684623437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22084658.

The product of its digits is 580608, while the sum is 43.

The square root of 684623437 is about 26165.3098013381. The cubic root of 684623437 is about 881.3544212934.

The spelling of 684623437 in words is "six hundred eighty-four million, six hundred twenty-three thousand, four hundred thirty-seven".