1139864271 has 48 divisors (see below), whose sum is σ = 1887505920. Its totient is φ = 599114880.

The previous prime is 1139864213. The next prime is 1139864293. The reversal of 1139864271 is 1724689311.

It is a happy number.

It is not a de Polignac number, because 1139864271 - 2¹⁸ = 1139602127 is a prime.

It is a super-2 number, since 2×1139864271² = 2598581112604722882, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139864171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1806126 + ... + 1806756.

It is an arithmetic number, because the mean of its divisors is an integer number (39323040).

Almost surely, 2^1139864271 is an apocalyptic number.

1139864271 is a deficient number, since it is larger than the sum of its proper divisors (747641649).

1139864271 is a wasteful number, since it uses less digits than its factorization.

1139864271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 1163 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 1139864271 is about 33761.8759994169. The cubic root of 1139864271 is about 1044.6024665583.

The spelling of 1139864271 in words is "one billion, one hundred thirty-nine million, eight hundred sixty-four thousand, two hundred seventy-one".