1138947918 has 16 divisors (see below), whose sum is σ = 2316504960. Its totient is φ = 373214456.

The previous prime is 1138947917. The next prime is 1138947937. The reversal of 1138947918 is 8197498311.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138947917) 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, 1608330 + ... + 1609037.

It is an arithmetic number, because the mean of its divisors is an integer number (144781560).

Almost surely, 2^1138947918 is an apocalyptic number.

1138947918 is an abundant number, since it is smaller than the sum of its proper divisors (1177557042).

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

1138947918 is a wasteful number, since it uses less digits than its factorization.

1138947918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217431.

The product of its digits is 435456, while the sum is 51.

The square root of 1138947918 is about 33748.3024461972. The cubic root of 1138947918 is about 1044.3224679503.

The spelling of 1138947918 in words is "one billion, one hundred thirty-eight million, nine hundred forty-seven thousand, nine hundred eighteen".