212691398 has 4 divisors (see below), whose sum is σ = 319037100. Its totient is φ = 106345698.

The previous prime is 212691397. The next prime is 212691421. The reversal of 212691398 is 893196212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212691397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53172848 + ... + 53172851.

It is an arithmetic number, because the mean of its divisors is an integer number (79759275).

Almost surely, 2^212691398 is an apocalyptic number.

212691398 is a deficient number, since it is larger than the sum of its proper divisors (106345702).

212691398 is a wasteful number, since it uses less digits than its factorization.

212691398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106345701.

The product of its digits is 46656, while the sum is 41.

The square root of 212691398 is about 14583.9431567735. The cubic root of 212691398 is about 596.9207032171.

The spelling of 212691398 in words is "two hundred twelve million, six hundred ninety-one thousand, three hundred ninety-eight".