118997780 has 48 divisors (see below), whose sum is σ = 274760640. Its totient is φ = 42931200.

The previous prime is 118997777. The next prime is 118997783. The reversal of 118997780 is 87799811.

118997780 = 55² + 56² + ... + 709².

It is an interprime number because it is at equal distance from previous prime (118997777) and next prime (118997783).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118997783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26756 + ... + 30884.

It is an arithmetic number, because the mean of its divisors is an integer number (5724180).

Almost surely, 2^118997780 is an apocalyptic number.

118997780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 118997780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137380320).

118997780 is an abundant number, since it is smaller than the sum of its proper divisors (155762860).

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

118997780 is a wasteful number, since it uses less digits than its factorization.

118997780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280 (or 4278 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 50.

The square root of 118997780 is about 10908.6103606280. The cubic root of 118997780 is about 491.8654147490.

The spelling of 118997780 in words is "one hundred eighteen million, nine hundred ninety-seven thousand, seven hundred eighty".