215228739 has 8 divisors (see below), whose sum is σ = 313060032. Its totient is φ = 130441640.

The previous prime is 215228693. The next prime is 215228759. The reversal of 215228739 is 937822512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215228739 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 215228697 and 215228706.

It is not an unprimeable number, because it can be changed into a prime (215228759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3261009 + ... + 3261074.

It is an arithmetic number, because the mean of its divisors is an integer number (39132504).

Almost surely, 2^215228739 is an apocalyptic number.

215228739 is a deficient number, since it is larger than the sum of its proper divisors (97831293).

215228739 is a wasteful number, since it uses less digits than its factorization.

215228739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6522097.

The product of its digits is 60480, while the sum is 39.

The square root of 215228739 is about 14670.6761602865. The cubic root of 215228739 is about 599.2850177836.

The spelling of 215228739 in words is "two hundred fifteen million, two hundred twenty-eight thousand, seven hundred thirty-nine".