1181213840 has 40 divisors (see below), whose sum is σ = 2761698240. Its totient is φ = 469840256.

The previous prime is 1181213833. The next prime is 1181213849. The reversal of 1181213840 is 483121811.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1181213840² = 2790532271615091200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1181213849) 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, 26924 + ... + 55563.

It is an arithmetic number, because the mean of its divisors is an integer number (69042456).

Almost surely, 2^1181213840 is an apocalyptic number.

1181213840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1181213840 is an abundant number, since it is smaller than the sum of its proper divisors (1580484400).

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

1181213840 is a wasteful number, since it uses less digits than its factorization.

1181213840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82679 (or 82673 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 1181213840 is about 34368.7916575489. The cubic root of 1181213840 is about 1057.0840232310.

It can be divided in two parts, 11812 and 13840, that added together give a palindrome (25652).

The spelling of 1181213840 in words is "one billion, one hundred eighty-one million, two hundred thirteen thousand, eight hundred forty".