218965997 has 8 divisors (see below), whose sum is σ = 223886592. Its totient is φ = 214056400.

The previous prime is 218965973. The next prime is 218966009. The reversal of 218965997 is 799569812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218965997 - 2¹² = 218961901 is a prime.

It is a super-2 number, since 2×218965997² = 95892215684408018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218965897) 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, 47672 + ... + 52062.

It is an arithmetic number, because the mean of its divisors is an integer number (27985824).

Almost surely, 2^218965997 is an apocalyptic number.

It is an amenable number.

218965997 is a deficient number, since it is larger than the sum of its proper divisors (4920595).

218965997 is a wasteful number, since it uses less digits than its factorization.

218965997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499.

The product of its digits is 2449440, while the sum is 56.

The square root of 218965997 is about 14797.4996874472. The cubic root of 218965997 is about 602.7338183290.

It can be divided in two parts, 2189 and 65997, that added together give a palindrome (68186).

The spelling of 218965997 in words is "two hundred eighteen million, nine hundred sixty-five thousand, nine hundred ninety-seven".