215663942 has 12 divisors (see below), whose sum is σ = 350294940. Its totient is φ = 99537048.

The previous prime is 215663891. The next prime is 215663951. The reversal of 215663942 is 249366512.

215663942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×215663942³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215663896 and 215663905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 318692 + ... + 319367.

It is an arithmetic number, because the mean of its divisors is an integer number (29191245).

Almost surely, 2^215663942 is an apocalyptic number.

215663942 is a deficient number, since it is larger than the sum of its proper divisors (134630998).

215663942 is a wasteful number, since it uses less digits than its factorization.

215663942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638087 (or 638074 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 215663942 is about 14685.5010809982. The cubic root of 215663942 is about 599.6886736730.

The spelling of 215663942 in words is "two hundred fifteen million, six hundred sixty-three thousand, nine hundred forty-two".