213397905 has 16 divisors (see below), whose sum is σ = 390213504. Its totient is φ = 97553280.

The previous prime is 213397903. The next prime is 213397909. The reversal of 213397905 is 509793312.

It is not a de Polignac number, because 213397905 - 2¹ = 213397903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213397903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016076 + ... + 1016285.

It is an arithmetic number, because the mean of its divisors is an integer number (24388344).

Almost surely, 2^213397905 is an apocalyptic number.

It is an amenable number.

213397905 is a deficient number, since it is larger than the sum of its proper divisors (176815599).

213397905 is a wasteful number, since it uses less digits than its factorization.

213397905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032376.

The product of its (nonzero) digits is 51030, while the sum is 39.

The square root of 213397905 is about 14608.1451594650. The cubic root of 213397905 is about 597.5809125790.

The spelling of 213397905 in words is "two hundred thirteen million, three hundred ninety-seven thousand, nine hundred five".