213540397 has 8 divisors (see below), whose sum is σ = 247136000. Its totient is φ = 180717264.

The previous prime is 213540367. The next prime is 213540401. The reversal of 213540397 is 793045312.

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

It is not a de Polignac number, because 213540397 - 2¹¹ = 213538349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213540337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192522 + ... + 193627.

It is an arithmetic number, because the mean of its divisors is an integer number (30892000).

Almost surely, 2^213540397 is an apocalyptic number.

It is an amenable number.

213540397 is a deficient number, since it is larger than the sum of its proper divisors (33595603).

213540397 is an equidigital number, since it uses as much as digits as its factorization.

213540397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386235.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 213540397 is about 14613.0214877006. The cubic root of 213540397 is about 597.7138903824.

The spelling of 213540397 in words is "two hundred thirteen million, five hundred forty thousand, three hundred ninety-seven".