217612942 has 4 divisors (see below), whose sum is σ = 326419416. Its totient is φ = 108806470.

The previous prime is 217612939. The next prime is 217612973. The reversal of 217612942 is 249216712.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 217612898 and 217612907.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 54403234 + ... + 54403237.

It is an arithmetic number, because the mean of its divisors is an integer number (81604854).

Almost surely, 2^217612942 is an apocalyptic number.

217612942 is a deficient number, since it is larger than the sum of its proper divisors (108806474).

217612942 is a wasteful number, since it uses less digits than its factorization.

217612942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108806473.

The product of its digits is 12096, while the sum is 34.

The square root of 217612942 is about 14751.7097992063. The cubic root of 217612942 is about 601.4897627649.

The spelling of 217612942 in words is "two hundred seventeen million, six hundred twelve thousand, nine hundred forty-two".