623947321 has 4 divisors (see below), whose sum is σ = 625594000. Its totient is φ = 622300644.

The previous prime is 623947319. The next prime is 623947339. The reversal of 623947321 is 123749326.

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: 123749326 = 2 ⋅61874663.

It is a cyclic number.

It is not a de Polignac number, because 623947321 - 2¹ = 623947319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623947421) 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, 822771 + ... + 823528.

It is an arithmetic number, because the mean of its divisors is an integer number (156398500).

Almost surely, 2^623947321 is an apocalyptic number.

It is an amenable number.

623947321 is a deficient number, since it is larger than the sum of its proper divisors (1646679).

623947321 is a wasteful number, since it uses less digits than its factorization.

623947321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646678.

The product of its digits is 54432, while the sum is 37.

The square root of 623947321 is about 24978.9375474619. The cubic root of 623947321 is about 854.5076887198.

The spelling of 623947321 in words is "six hundred twenty-three million, nine hundred forty-seven thousand, three hundred twenty-one".