213474857 has 4 divisors (see below), whose sum is σ = 214234836. Its totient is φ = 212714880.

The previous prime is 213474853. The next prime is 213474869. The reversal of 213474857 is 758474312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66846976 + 146627881 = 8176^2 + 12109^2 .

It is a cyclic number.

It is not a de Polignac number, because 213474857 - 2² = 213474853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213474853) 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, 379568 + ... + 380129.

It is an arithmetic number, because the mean of its divisors is an integer number (53558709).

Almost surely, 2^213474857 is an apocalyptic number.

It is an amenable number.

213474857 is a deficient number, since it is larger than the sum of its proper divisors (759979).

213474857 is an equidigital number, since it uses as much as digits as its factorization.

213474857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759978.

The product of its digits is 188160, while the sum is 41.

The square root of 213474857 is about 14610.7787951225. The cubic root of 213474857 is about 597.6527338403.

The spelling of 213474857 in words is "two hundred thirteen million, four hundred seventy-four thousand, eight hundred fifty-seven".