1138479945 has 32 divisors (see below), whose sum is σ = 1839024000. Its totient is φ = 601396224.

The previous prime is 1138479887. The next prime is 1138479949. The reversal of 1138479945 is 5499748311.

It is not a de Polignac number, because 1138479945 - 2¹⁰ = 1138478921 is a prime.

It is a super-2 number, since 2×1138479945² = 2592273170334406050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1138479949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1324926 + ... + 1325784.

It is an arithmetic number, because the mean of its divisors is an integer number (57469500).

Almost surely, 2^1138479945 is an apocalyptic number.

1138479945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1138479945 is a deficient number, since it is larger than the sum of its proper divisors (700544055).

1138479945 is a wasteful number, since it uses less digits than its factorization.

1138479945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its digits is 1088640, while the sum is 51.

The square root of 1138479945 is about 33741.3684517982. The cubic root of 1138479945 is about 1044.1794173154.

The spelling of 1138479945 in words is "one billion, one hundred thirty-eight million, four hundred seventy-nine thousand, nine hundred forty-five".