217143642 has 16 divisors (see below), whose sum is σ = 434431872. Its totient is φ = 72357120.

The previous prime is 217143629. The next prime is 217143643. The reversal of 217143642 is 246341712.

It is a super-2 number, since 2×217143642² = 94302722522048328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217143643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31098 + ... + 37434.

It is an arithmetic number, because the mean of its divisors is an integer number (27151992).

Almost surely, 2^217143642 is an apocalyptic number.

217143642 is an abundant number, since it is smaller than the sum of its proper divisors (217288230).

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

217143642 is a wasteful number, since it uses less digits than its factorization.

217143642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12053.

The product of its digits is 8064, while the sum is 30.

The square root of 217143642 is about 14735.7945832588. The cubic root of 217143642 is about 601.0570643756.

The spelling of 217143642 in words is "two hundred seventeen million, one hundred forty-three thousand, six hundred forty-two".