213187826 has 4 divisors (see below), whose sum is σ = 319781742. Its totient is φ = 106593912.

The previous prime is 213187811. The next prime is 213187829. The reversal of 213187826 is 628781312.

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

It can be written as a sum of positive squares in only one way, i.e., 110145025 + 103042801 = 10495^2 + 10151^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 213187826.

It is not an unprimeable number, because it can be changed into a prime (213187829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53296955 + ... + 53296958.

Almost surely, 2^213187826 is an apocalyptic number.

213187826 is a deficient number, since it is larger than the sum of its proper divisors (106593916).

213187826 is a wasteful number, since it uses less digits than its factorization.

213187826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106593915.

The product of its digits is 32256, while the sum is 38.

The square root of 213187826 is about 14600.9529141080. The cubic root of 213187826 is about 597.3847525485.

The spelling of 213187826 in words is "two hundred thirteen million, one hundred eighty-seven thousand, eight hundred twenty-six".