387820181 has 16 divisors (see below), whose sum is σ = 466608384. Its totient is φ = 315135744.

The previous prime is 387820177. The next prime is 387820207. The reversal of 387820181 is 181028783.

It is not a de Polignac number, because 387820181 - 2² = 387820177 is a prime.

It is a super-2 number, since 2×387820181² = 300808985581745522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387820481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7535 + ... + 28851.

It is an arithmetic number, because the mean of its divisors is an integer number (29163024).

Almost surely, 2^387820181 is an apocalyptic number.

It is an amenable number.

387820181 is a deficient number, since it is larger than the sum of its proper divisors (78788203).

387820181 is a wasteful number, since it uses less digits than its factorization.

387820181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21460.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 387820181 is about 19693.1506113166. The cubic root of 387820181 is about 729.2506108411.

The spelling of 387820181 in words is "three hundred eighty-seven million, eight hundred twenty thousand, one hundred eighty-one".