213723506 has 8 divisors (see below), whose sum is σ = 324447984. Its totient is φ = 105574180.

The previous prime is 213723491. The next prime is 213723509. The reversal of 213723506 is 605327312.

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

It is not an unprimeable number, because it can be changed into a prime (213723509) 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, 643580 + ... + 643911.

It is an arithmetic number, because the mean of its divisors is an integer number (40555998).

Almost surely, 2^213723506 is an apocalyptic number.

213723506 is a deficient number, since it is larger than the sum of its proper divisors (110724478).

213723506 is a wasteful number, since it uses less digits than its factorization.

213723506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287576.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 213723506 is about 14619.2854134530. The cubic root of 213723506 is about 597.8846863628.

The spelling of 213723506 in words is "two hundred thirteen million, seven hundred twenty-three thousand, five hundred six".