1438718618 has 16 divisors (see below), whose sum is σ = 2282031360. Its totient is φ = 679173600.

The previous prime is 1438718591. The next prime is 1438718651. The reversal of 1438718618 is 8168178341.

It is a super-2 number, since 2×1438718618² = 4139822523559659848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280448 + ... + 285531.

It is an arithmetic number, because the mean of its divisors is an integer number (142626960).

Almost surely, 2^1438718618 is an apocalyptic number.

1438718618 is a deficient number, since it is larger than the sum of its proper divisors (843312742).

1438718618 is a wasteful number, since it uses less digits than its factorization.

1438718618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566053.

The product of its digits is 258048, while the sum is 47.

The square root of 1438718618 is about 37930.4444740633. Note that the first 4 decimals coincide. The cubic root of 1438718618 is about 1128.9081834146.

The spelling of 1438718618 in words is "one billion, four hundred thirty-eight million, seven hundred eighteen thousand, six hundred eighteen".