215391340 has 24 divisors (see below), whose sum is σ = 454208832. Its totient is φ = 85797120.

The previous prime is 215391331. The next prime is 215391349. The reversal of 215391340 is 43193512.

It is an interprime number because it is at equal distance from previous prime (215391331) and next prime (215391349).

It is a junction number, because it is equal to n+sod(n) for n = 215391299 and 215391308.

It is not an unprimeable number, because it can be changed into a prime (215391349) 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, 17524 + ... + 27163.

It is an arithmetic number, because the mean of its divisors is an integer number (18925368).

Almost surely, 2^215391340 is an apocalyptic number.

215391340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215391340 is an abundant number, since it is smaller than the sum of its proper divisors (238817492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215391340 is a wasteful number, since it uses less digits than its factorization.

215391340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44937 (or 44935 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 215391340 is about 14676.2168149697. The cubic root of 215391340 is about 599.4358957361.

The spelling of 215391340 in words is "two hundred fifteen million, three hundred ninety-one thousand, three hundred forty".