212391963 has 28 divisors (see below), whose sum is σ = 363942768. Its totient is φ = 121363920.

The previous prime is 212391961. The next prime is 212391973. The reversal of 212391963 is 369193212.

It is a happy number.

It is not a de Polignac number, because 212391963 - 2¹ = 212391961 is a prime.

It is a super-2 number, since 2×212391963² = 90220691893986738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212391961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 15708 + ... + 25913.

It is an arithmetic number, because the mean of its divisors is an integer number (12997956).

Almost surely, 2^212391963 is an apocalyptic number.

212391963 is a deficient number, since it is larger than the sum of its proper divisors (151550805).

212391963 is an frugal number, since it uses more digits than its factorization.

212391963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41646 (or 41631 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 212391963 is about 14573.6736274695. The cubic root of 212391963 is about 596.6404491391.

The spelling of 212391963 in words is "two hundred twelve million, three hundred ninety-one thousand, nine hundred sixty-three".