1438932618 has 12 divisors (see below), whose sum is σ = 3117687378. Its totient is φ = 479644200.

The previous prime is 1438932617. The next prime is 1438932619. The reversal of 1438932618 is 8162398341.

1438932618 is a `hidden beast` number, since 1 + 4 + 389 + 3 + 261 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1438932617) and next prime (1438932619).

It can be written as a sum of positive squares in only one way, i.e., 1421817849 + 17114769 = 37707^2 + 4137^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1438932617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39970333 + ... + 39970368.

Almost surely, 2^1438932618 is an apocalyptic number.

1438932618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1438932618 is an abundant number, since it is smaller than the sum of its proper divisors (1678754760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438932618 is a wasteful number, since it uses less digits than its factorization.

1438932618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79940709 (or 79940706 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 1438932618 is about 37933.2653221417. The cubic root of 1438932618 is about 1128.9641532133.

The spelling of 1438932618 in words is "one billion, four hundred thirty-eight million, nine hundred thirty-two thousand, six hundred eighteen".