216587942 has 16 divisors (see below), whose sum is σ = 331010064. Its totient is φ = 106260000.

The previous prime is 216587927. The next prime is 216587951. The reversal of 216587942 is 249785612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 216587893 and 216587902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54317 + ... + 58167.

It is an arithmetic number, because the mean of its divisors is an integer number (20688129).

Almost surely, 2^216587942 is an apocalyptic number.

216587942 is a deficient number, since it is larger than the sum of its proper divisors (114422122).

216587942 is a wasteful number, since it uses less digits than its factorization.

216587942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375.

The product of its digits is 241920, while the sum is 44.

The square root of 216587942 is about 14716.9270569640. The cubic root of 216587942 is about 600.5438975509.

The spelling of 216587942 in words is "two hundred sixteen million, five hundred eighty-seven thousand, nine hundred forty-two".