387492991 has 2 divisors, whose sum is σ = 387492992. Its totient is φ = 387492990.

The previous prime is 387492977. The next prime is 387492997. The reversal of 387492991 is 199294783.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 387492991 - 2¹⁵ = 387460223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387492997) 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 as a sum of consecutive naturals, namely, 193746495 + 193746496.

It is an arithmetic number, because the mean of its divisors is an integer number (193746496).

Almost surely, 2^387492991 is an apocalyptic number.

387492991 is a deficient number, since it is larger than the sum of its proper divisors (1).

387492991 is an equidigital number, since it uses as much as digits as its factorization.

387492991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 387492991 is about 19684.8416554465. The cubic root of 387492991 is about 729.0454722649.

The spelling of 387492991 in words is "three hundred eighty-seven million, four hundred ninety-two thousand, nine hundred ninety-one".