387402181 has 2 divisors, whose sum is σ = 387402182. Its totient is φ = 387402180.

The previous prime is 387402163. The next prime is 387402193. The reversal of 387402181 is 181204783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376709281 + 10692900 = 19409^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 387402181 - 2⁵ = 387402149 is a prime.

It is a super-2 number, since 2×387402181² = 300160899687113522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387402101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193701090 + 193701091.

It is an arithmetic number, because the mean of its divisors is an integer number (193701091).

Almost surely, 2^387402181 is an apocalyptic number.

It is an amenable number.

387402181 is a deficient number, since it is larger than the sum of its proper divisors (1).

387402181 is an equidigital number, since it uses as much as digits as its factorization.

387402181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 387402181 is about 19682.5349231241. The cubic root of 387402181 is about 728.9885165751.

The spelling of 387402181 in words is "three hundred eighty-seven million, four hundred two thousand, one hundred eighty-one".