387406121 has 2 divisors, whose sum is σ = 387406122. Its totient is φ = 387406120.

The previous prime is 387406093. The next prime is 387406139. The reversal of 387406121 is 121604783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338560000 + 48846121 = 18400^2 + 6989^2 .

It is an emirp because it is prime and its reverse (121604783) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387406121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (387402121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193703060 + 193703061.

It is an arithmetic number, because the mean of its divisors is an integer number (193703061).

Almost surely, 2^387406121 is an apocalyptic number.

It is an amenable number.

387406121 is a deficient number, since it is larger than the sum of its proper divisors (1).

387406121 is an equidigital number, since it uses as much as digits as its factorization.

387406121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 387406121 is about 19682.6350116035. The cubic root of 387406121 is about 728.9909879130.

The spelling of 387406121 in words is "three hundred eighty-seven million, four hundred six thousand, one hundred twenty-one".