1178223990 has 64 divisors (see below), whose sum is σ = 2962040832. Its totient is φ = 299376000.

The previous prime is 1178223989. The next prime is 1178223997. The reversal of 1178223990 is 993228711.

It is a super-2 number, since 2×1178223990² = 2776423541223040200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1178223997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183840 + ... + 190140.

It is an arithmetic number, because the mean of its divisors is an integer number (46281888).

Almost surely, 2^1178223990 is an apocalyptic number.

1178223990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1178223990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1481020416).

1178223990 is an abundant number, since it is smaller than the sum of its proper divisors (1783816842).

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

1178223990 is a wasteful number, since it uses less digits than its factorization.

1178223990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6605.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1178223990 is about 34325.2675153450. The cubic root of 1178223990 is about 1056.1913841169.

The spelling of 1178223990 in words is "one billion, one hundred seventy-eight million, two hundred twenty-three thousand, nine hundred ninety".