1181213838 has 48 divisors (see below), whose sum is σ = 2930928000. Its totient is φ = 336795408.

The previous prime is 1181213833. The next prime is 1181213849. The reversal of 1181213838 is 8383121811.

It is a super-2 number, since 2×1181213838² = 2790532262165380488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181213833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53481 + ... + 72267.

It is an arithmetic number, because the mean of its divisors is an integer number (61061000).

Almost surely, 2^1181213838 is an apocalyptic number.

1181213838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1181213838 is an abundant number, since it is smaller than the sum of its proper divisors (1749714162).

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

1181213838 is a wasteful number, since it uses less digits than its factorization.

1181213838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19301 (or 19298 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 1181213838 is about 34368.7916284527. The cubic root of 1181213838 is about 1057.0840226344.

The spelling of 1181213838 in words is "one billion, one hundred eighty-one million, two hundred thirteen thousand, eight hundred thirty-eight".