1138478943 has 16 divisors (see below), whose sum is σ = 1735374080. Its totient is φ = 650353536.

The previous prime is 1138478923. The next prime is 1138478953. The reversal of 1138478943 is 3498748311.

It is a happy number.

It is not a de Polignac number, because 1138478943 - 2⁵ = 1138478911 is a prime.

It is a super-2 number, since 2×1138478943² = 2592268607308794498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1138478892 and 1138478901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138478923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81228 + ... + 94206.

It is an arithmetic number, because the mean of its divisors is an integer number (108460880).

Almost surely, 2^1138478943 is an apocalyptic number.

1138478943 is a deficient number, since it is larger than the sum of its proper divisors (596895137).

1138478943 is a wasteful number, since it uses less digits than its factorization.

1138478943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17166.

The product of its digits is 580608, while the sum is 48.

The square root of 1138478943 is about 33741.3536035530. The cubic root of 1138478943 is about 1044.1791109806.

The spelling of 1138478943 in words is "one billion, one hundred thirty-eight million, four hundred seventy-eight thousand, nine hundred forty-three".