217452942 has 48 divisors (see below), whose sum is σ = 540090720. Its totient is φ = 61940736.

The previous prime is 217452923. The next prime is 217452947. The reversal of 217452942 is 249254712.

217452942 is a `hidden beast` number, since 21 + 74 + 529 + 42 = 666.

217452942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 217452897 and 217452906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217452947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42034 + ... + 46922.

It is an arithmetic number, because the mean of its divisors is an integer number (11251890).

Almost surely, 2^217452942 is an apocalyptic number.

217452942 is an abundant number, since it is smaller than the sum of its proper divisors (322637778).

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

217452942 is a wasteful number, since it uses less digits than its factorization.

217452942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257 (or 5254 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 217452942 is about 14746.2857018301. The cubic root of 217452942 is about 601.3423114273.

The spelling of 217452942 in words is "two hundred seventeen million, four hundred fifty-two thousand, nine hundred forty-two".