213791397 has 16 divisors (see below), whose sum is σ = 294653760. Its totient is φ = 137808000.

The previous prime is 213791381. The next prime is 213791429. The reversal of 213791397 is 793197312.

It is not a de Polignac number, because 213791397 - 2⁴ = 213791381 is a prime.

It is a super-2 number, since 2×213791397² = 91413522862423218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213791327) 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, 897 + ... + 20697.

It is an arithmetic number, because the mean of its divisors is an integer number (18415860).

Almost surely, 2^213791397 is an apocalyptic number.

It is an amenable number.

213791397 is a deficient number, since it is larger than the sum of its proper divisors (80862363).

213791397 is a wasteful number, since it uses less digits than its factorization.

213791397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19924.

The product of its digits is 71442, while the sum is 42.

The square root of 213791397 is about 14621.6071962011. The cubic root of 213791397 is about 597.9479872958.

The spelling of 213791397 in words is "two hundred thirteen million, seven hundred ninety-one thousand, three hundred ninety-seven".