1218640319 has 8 divisors (see below), whose sum is σ = 1330360752. Its totient is φ = 1109488320.

The previous prime is 1218640309. The next prime is 1218640327. The reversal of 1218640319 is 9130468121.

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 1218640319 - 2⁸ = 1218640063 is a prime.

It is a super-2 number, since 2×1218640319² = 2970168454184843522, 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 (1218640309) 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, 641117 + ... + 643014.

It is an arithmetic number, because the mean of its divisors is an integer number (166295094).

Almost surely, 2^1218640319 is an apocalyptic number.

1218640319 is a deficient number, since it is larger than the sum of its proper divisors (111720433).

1218640319 is a wasteful number, since it uses less digits than its factorization.

1218640319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284217.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1218640319 is about 34909.0291901680. The cubic root of 1218640319 is about 1068.1326264220.

The spelling of 1218640319 in words is "one billion, two hundred eighteen million, six hundred forty thousand, three hundred nineteen".