212923507 has 4 divisors (see below), whose sum is σ = 216532440. Its totient is φ = 209314576.

The previous prime is 212923457. The next prime is 212923523. The reversal of 212923507 is 705329212.

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

It is a cyclic number.

It is not a de Polignac number, because 212923507 - 2⁷ = 212923379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212923547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804378 + ... + 1804495.

It is an arithmetic number, because the mean of its divisors is an integer number (54133110).

Almost surely, 2^212923507 is an apocalyptic number.

212923507 is a deficient number, since it is larger than the sum of its proper divisors (3608933).

212923507 is an equidigital number, since it uses as much as digits as its factorization.

212923507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608932.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 212923507 is about 14591.8986770057. The cubic root of 212923507 is about 597.1377630817.

The spelling of 212923507 in words is "two hundred twelve million, nine hundred twenty-three thousand, five hundred seven".