1188388049 has 4 divisors (see below), whose sum is σ = 1189049700. Its totient is φ = 1187726400.

The previous prime is 1188388037. The next prime is 1188388067. The reversal of 1188388049 is 9408838811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229371025 + 959017024 = 15145^2 + 30968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1188388049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1188387988 and 1188388006.

It is not an unprimeable number, because it can be changed into a prime (1188382049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328124 + ... + 331725.

It is an arithmetic number, because the mean of its divisors is an integer number (297262425).

Almost surely, 2^1188388049 is an apocalyptic number.

It is an amenable number.

1188388049 is a deficient number, since it is larger than the sum of its proper divisors (661651).

1188388049 is an equidigital number, since it uses as much as digits as its factorization.

1188388049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661650.

The product of its (nonzero) digits is 442368, while the sum is 50.

The square root of 1188388049 is about 34473.0046413132. The cubic root of 1188388049 is about 1059.2198035446.

The spelling of 1188388049 in words is "one billion, one hundred eighty-eight million, three hundred eighty-eight thousand, forty-nine".