215428197 has 8 divisors (see below), whose sum is σ = 288156544. Its totient is φ = 143159328.

The previous prime is 215428193. The next prime is 215428201. The reversal of 215428197 is 791824512.

It is an interprime number because it is at equal distance from previous prime (215428193) and next prime (215428201).

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

It is not a de Polignac number, because 215428197 - 2² = 215428193 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 (215428193) 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, 113773 + ... + 115650.

It is an arithmetic number, because the mean of its divisors is an integer number (36019568).

Almost surely, 2^215428197 is an apocalyptic number.

It is an amenable number.

215428197 is a deficient number, since it is larger than the sum of its proper divisors (72728347).

215428197 is a wasteful number, since it uses less digits than its factorization.

215428197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229739.

The product of its digits is 40320, while the sum is 39.

The square root of 215428197 is about 14677.4724322684. The cubic root of 215428197 is about 599.4700848989.

The spelling of 215428197 in words is "two hundred fifteen million, four hundred twenty-eight thousand, one hundred ninety-seven".