223978613 has 8 divisors (see below), whose sum is σ = 229798296. Its totient is φ = 218176000.

The previous prime is 223978607. The next prime is 223978619. The reversal of 223978613 is 316879322.

223978613 = 10582² + 10583².

It is an interprime number because it is at equal distance from previous prime (223978607) and next prime (223978619).

It can be written as a sum of positive squares in 4 ways, for example, as 77035729 + 146942884 = 8777^2 + 12122^2 .

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 223978613 - 2⁶ = 223978549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223978619) 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, 24845 + ... + 32637.

It is an arithmetic number, because the mean of its divisors is an integer number (28724787).

Almost surely, 2^223978613 is an apocalyptic number.

223978613 is the 10583-rd centered square number.

It is an amenable number.

223978613 is a deficient number, since it is larger than the sum of its proper divisors (5819683).

223978613 is an equidigital number, since it uses as much as digits as its factorization.

223978613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8535.

The product of its digits is 108864, while the sum is 41.

The square root of 223978613 is about 14965.9150405179. The cubic root of 223978613 is about 607.2984653289.

The spelling of 223978613 in words is "two hundred twenty-three million, nine hundred seventy-eight thousand, six hundred thirteen".