1139687749 has 8 divisors (see below), whose sum is σ = 1146664728. Its totient is φ = 1132723200.

The previous prime is 1139687729. The next prime is 1139687767. The reversal of 1139687749 is 9477869311.

It can be written as a sum of positive squares in 4 ways, for example, as 11937025 + 1127750724 = 3455^2 + 33582^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1139687749 - 2¹⁹ = 1139163461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1139687749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139687729) 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, 234189 + ... + 239005.

It is an arithmetic number, because the mean of its divisors is an integer number (143333091).

Almost surely, 2^1139687749 is an apocalyptic number.

It is an amenable number.

1139687749 is a deficient number, since it is larger than the sum of its proper divisors (6976979).

1139687749 is a wasteful number, since it uses less digits than its factorization.

1139687749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6215.

The product of its digits is 2286144, while the sum is 55.

The square root of 1139687749 is about 33759.2616773531. The cubic root of 1139687749 is about 1044.5485405951.

The spelling of 1139687749 in words is "one billion, one hundred thirty-nine million, six hundred eighty-seven thousand, seven hundred forty-nine".