212397 has 8 divisors (see below), whose sum is σ = 286944. Its totient is φ = 139728.

The previous prime is 212383. The next prime is 212411. The reversal of 212397 is 793212.

It is an interprime number because it is at equal distance from previous prime (212383) and next prime (212411).

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

It is not a de Polignac number, because 212397 - 2⁸ = 212141 is a prime.

It is a super-2 number, since 2×212397² = 90224971218, which contains 22 as substring.

212397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212297) 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, 178 + ... + 675.

It is an arithmetic number, because the mean of its divisors is an integer number (35868).

2²¹²³⁹⁷ is an apocalyptic number.

It is an amenable number.

212397 is a deficient number, since it is larger than the sum of its proper divisors (74547).

212397 is an equidigital number, since it uses as much as digits as its factorization.

212397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its digits is 756, while the sum is 24.

The square root of 212397 is about 460.8654901378. The cubic root of 212397 is about 59.6645165661.

The spelling of 212397 in words is "two hundred twelve thousand, three hundred ninety-seven".