118039821 has 4 divisors (see below), whose sum is σ = 157386432. Its totient is φ = 78693212.

The previous prime is 118039813. The next prime is 118039853. The reversal of 118039821 is 128930811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128930811 = 3 ⋅42976937.

It is a cyclic number.

It is not a de Polignac number, because 118039821 - 2³ = 118039813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118039121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19673301 + ... + 19673306.

It is an arithmetic number, because the mean of its divisors is an integer number (39346608).

Almost surely, 2^118039821 is an apocalyptic number.

It is an amenable number.

118039821 is a deficient number, since it is larger than the sum of its proper divisors (39346611).

118039821 is an equidigital number, since it uses as much as digits as its factorization.

118039821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39346610.

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

The square root of 118039821 is about 10864.6132466830. The cubic root of 118039821 is about 490.5419811713.

The spelling of 118039821 in words is "one hundred eighteen million, thirty-nine thousand, eight hundred twenty-one".