1138364478 has 12 divisors (see below), whose sum is σ = 2466456408. Its totient is φ = 379454820.

The previous prime is 1138364477. The next prime is 1138364503. The reversal of 1138364478 is 8744638311.

1138364478 is a `hidden beast` number, since 113 + 8 + 3 + 64 + 478 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138364471) 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, 31621218 + ... + 31621253.

It is an arithmetic number, because the mean of its divisors is an integer number (205538034).

Almost surely, 2^1138364478 is an apocalyptic number.

1138364478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1138364478 is an abundant number, since it is smaller than the sum of its proper divisors (1328091930).

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

1138364478 is a wasteful number, since it uses less digits than its factorization.

1138364478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63242479 (or 63242476 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 1138364478 is about 33739.6573485861. The cubic root of 1138364478 is about 1044.1441151737.

The spelling of 1138364478 in words is "one billion, one hundred thirty-eight million, three hundred sixty-four thousand, four hundred seventy-eight".