217940254 has 16 divisors (see below), whose sum is σ = 382301568. Its totient is φ = 91230552.

The previous prime is 217940243. The next prime is 217940257. The reversal of 217940254 is 452049712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217940257) 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, 180412 + ... + 181615.

It is an arithmetic number, because the mean of its divisors is an integer number (23893848).

Almost surely, 2^217940254 is an apocalyptic number.

217940254 is a deficient number, since it is larger than the sum of its proper divisors (164361314).

217940254 is a wasteful number, since it uses less digits than its factorization.

217940254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362079.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 217940254 is about 14762.7996667299. The cubic root of 217940254 is about 601.7911789571.

Adding to 217940254 its reverse (452049712), we get a palindrome (669989966).

The spelling of 217940254 in words is "two hundred seventeen million, nine hundred forty thousand, two hundred fifty-four".