1218419389 has 8 divisors (see below), whose sum is σ = 1332954432. Its totient is φ = 1104512640.

The previous prime is 1218419383. The next prime is 1218419407. The reversal of 1218419389 is 9839148121.

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

It is a de Polignac number, because none of the positive numbers 2^k-1218419389 is a prime.

It is a super-2 number, since 2×1218419389² = 2969091614982266642, 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 (1218419383) 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, 153009 + ... + 160774.

It is an arithmetic number, because the mean of its divisors is an integer number (166619304).

Almost surely, 2^1218419389 is an apocalyptic number.

It is an amenable number.

1218419389 is a deficient number, since it is larger than the sum of its proper divisors (114535043).

1218419389 is a wasteful number, since it uses less digits than its factorization.

1218419389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314147.

The product of its digits is 124416, while the sum is 46.

The square root of 1218419389 is about 34905.8646791624. The cubic root of 1218419389 is about 1068.0680744785.

The spelling of 1218419389 in words is "one billion, two hundred eighteen million, four hundred nineteen thousand, three hundred eighty-nine".