215188893 has 12 divisors (see below), whose sum is σ = 322340928. Its totient is φ = 143459100.

The previous prime is 215188879. The next prime is 215188901. The reversal of 215188893 is 398881512.

It is a happy number.

It is not a de Polignac number, because 215188893 - 2⁸ = 215188637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215188843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 442533 + ... + 443018.

It is an arithmetic number, because the mean of its divisors is an integer number (26861744).

Almost surely, 2^215188893 is an apocalyptic number.

It is an amenable number.

215188893 is a deficient number, since it is larger than the sum of its proper divisors (107152035).

215188893 is an frugal number, since it uses more digits than its factorization.

215188893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885566 (or 885554 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 215188893 is about 14669.3180823104. The cubic root of 215188893 is about 599.2480329697.

The spelling of 215188893 in words is "two hundred fifteen million, one hundred eighty-eight thousand, eight hundred ninety-three".