1188138042 has 48 divisors (see below), whose sum is σ = 3168372480. Its totient is φ = 313354656.

The previous prime is 1188138037. The next prime is 1188138073. The reversal of 1188138042 is 2408318811.

It is a junction number, because it is equal to n+sod(n) for n = 1188137988 and 1188138006.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 361042 + ... + 364317.

It is an arithmetic number, because the mean of its divisors is an integer number (66007760).

Almost surely, 2^1188138042 is an apocalyptic number.

1188138042 is an abundant number, since it is smaller than the sum of its proper divisors (1980234438).

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

1188138042 is a wasteful number, since it uses less digits than its factorization.

1188138042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725387 (or 725384 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1188138042 is about 34469.3783233757. The cubic root of 1188138042 is about 1059.1455205869.

The spelling of 1188138042 in words is "one billion, one hundred eighty-eight million, one hundred thirty-eight thousand, forty-two".