1188427638 has 16 divisors (see below), whose sum is σ = 2378301120. Its totient is φ = 395901576.

The previous prime is 1188427633. The next prime is 1188427651. The reversal of 1188427638 is 8367248811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188427633) 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, 49408 + ... + 69411.

It is an arithmetic number, because the mean of its divisors is an integer number (148643820).

Almost surely, 2^1188427638 is an apocalyptic number.

1188427638 is an abundant number, since it is smaller than the sum of its proper divisors (1189873482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1188427638 is a wasteful number, since it uses less digits than its factorization.

1188427638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120491.

The product of its digits is 516096, while the sum is 48.

The square root of 1188427638 is about 34473.5788394533. The cubic root of 1188427638 is about 1059.2315654118.

The spelling of 1188427638 in words is "one billion, one hundred eighty-eight million, four hundred twenty-seven thousand, six hundred thirty-eight".