223212957 has 16 divisors (see below), whose sum is σ = 332226048. Its totient is φ = 132133680.

The previous prime is 223212889. The next prime is 223213037. The reversal of 223212957 is 759212322.

It is not a de Polignac number, because 223212957 - 2²³ = 214824349 is a prime.

It is a super-3 number, since 3×223212957³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223210957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77233 + ... + 80070.

It is an arithmetic number, because the mean of its divisors is an integer number (20764128).

Almost surely, 2^223212957 is an apocalyptic number.

It is an amenable number.

223212957 is a deficient number, since it is larger than the sum of its proper divisors (109013091).

223212957 is a wasteful number, since it uses less digits than its factorization.

223212957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157360.

The product of its digits is 15120, while the sum is 33.

The square root of 223212957 is about 14940.3131493286. The cubic root of 223212957 is about 606.6056721608.

The spelling of 223212957 in words is "two hundred twenty-three million, two hundred twelve thousand, nine hundred fifty-seven".