118290381 has 16 divisors (see below), whose sum is σ = 172827648. Its totient is φ = 71370800.

The previous prime is 118290373. The next prime is 118290383. The reversal of 118290381 is 183092811.

It is a cyclic number.

It is not a de Polignac number, because 118290381 - 2³ = 118290373 is a prime.

It is a super-2 number, since 2×118290381² = 27985228474250322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118290383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405 + ... + 15386.

It is an arithmetic number, because the mean of its divisors is an integer number (10801728).

Almost surely, 2^118290381 is an apocalyptic number.

118290381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

118290381 is a deficient number, since it is larger than the sum of its proper divisors (54537267).

118290381 is a wasteful number, since it uses less digits than its factorization.

118290381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16032.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 118290381 is about 10876.1381473389. The cubic root of 118290381 is about 490.8888226979. Note that the first 4 decimals are identical.

The spelling of 118290381 in words is "one hundred eighteen million, two hundred ninety thousand, three hundred eighty-one".