215156642 has 16 divisors (see below), whose sum is σ = 325188864. Its totient is φ = 106764000.

The previous prime is 215156629. The next prime is 215156653. The reversal of 215156642 is 246651512.

It is a junction number, because it is equal to n+sod(n) for n = 215156599 and 215156608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174167 + ... + 175397.

It is an arithmetic number, because the mean of its divisors is an integer number (20324304).

Almost surely, 2^215156642 is an apocalyptic number.

215156642 is a deficient number, since it is larger than the sum of its proper divisors (110032222).

215156642 is a wasteful number, since it uses less digits than its factorization.

215156642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its digits is 14400, while the sum is 32.

The square root of 215156642 is about 14668.2187739343. The cubic root of 215156642 is about 599.2180944451.

The spelling of 215156642 in words is "two hundred fifteen million, one hundred fifty-six thousand, six hundred forty-two".