213772947 has 8 divisors (see below), whose sum is σ = 289285056. Its totient is φ = 140388072.

The previous prime is 213772921. The next prime is 213772957. The reversal of 213772947 is 749277312.

It is a happy number.

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

It is not a de Polignac number, because 213772947 - 2⁶ = 213772883 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 213772899 and 213772908.

It is not an unprimeable number, because it can be changed into a prime (213772907) 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 in 7 ways as a sum of consecutive naturals, for example, 531573 + ... + 531974.

It is an arithmetic number, because the mean of its divisors is an integer number (36160632).

Almost surely, 2^213772947 is an apocalyptic number.

213772947 is a deficient number, since it is larger than the sum of its proper divisors (75512109).

213772947 is a wasteful number, since it uses less digits than its factorization.

213772947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063617.

The product of its digits is 148176, while the sum is 42.

The square root of 213772947 is about 14620.9762669939. The cubic root of 213772947 is about 597.9307860147.

The spelling of 213772947 in words is "two hundred thirteen million, seven hundred seventy-two thousand, nine hundred forty-seven".