1138947939 has 8 divisors (see below), whose sum is σ = 1687330320. Its totient is φ = 759298608.

The previous prime is 1138947937. The next prime is 1138947961. The reversal of 1138947939 is 9397498311.

It is a happy number.

1138947939 is a `hidden beast` number, since 1 + 138 + 9 + 479 + 39 = 666.

It is not a de Polignac number, because 1138947939 - 2¹ = 1138947937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138947937) 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, 21091602 + ... + 21091655.

It is an arithmetic number, because the mean of its divisors is an integer number (210916290).

Almost surely, 2^1138947939 is an apocalyptic number.

1138947939 is a deficient number, since it is larger than the sum of its proper divisors (548382381).

1138947939 is an equidigital number, since it uses as much as digits as its factorization.

1138947939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42183266 (or 42183260 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 1138947939 is about 33748.3027573240. The cubic root of 1138947939 is about 1044.3224743687.

The spelling of 1138947939 in words is "one billion, one hundred thirty-eight million, nine hundred forty-seven thousand, nine hundred thirty-nine".