1131939378 has 24 divisors (see below), whose sum is σ = 2453370816. Its totient is φ = 377184600.

The previous prime is 1131939371. The next prime is 1131939379. The reversal of 1131939378 is 8739391311.

It is not an unprimeable number, because it can be changed into a prime (1131939371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54243 + ... + 72153.

It is an arithmetic number, because the mean of its divisors is an integer number (102223784).

Almost surely, 2^1131939378 is an apocalyptic number.

1131939378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1131939378 is an abundant number, since it is smaller than the sum of its proper divisors (1321431438).

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

1131939378 is a wasteful number, since it uses less digits than its factorization.

1131939378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21430 (or 21427 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 1131939378 is about 33644.3067694967. The cubic root of 1131939378 is about 1042.1759723089.

The spelling of 1131939378 in words is "one billion, one hundred thirty-one million, nine hundred thirty-nine thousand, three hundred seventy-eight".