387774391 has 2 divisors, whose sum is σ = 387774392. Its totient is φ = 387774390.

The previous prime is 387774353. The next prime is 387774421. The reversal of 387774391 is 193477783.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 387774391 - 2⁹ = 387773879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387774991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193887195 + 193887196.

It is an arithmetic number, because the mean of its divisors is an integer number (193887196).

Almost surely, 2^387774391 is an apocalyptic number.

387774391 is a deficient number, since it is larger than the sum of its proper divisors (1).

387774391 is an equidigital number, since it uses as much as digits as its factorization.

387774391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 387774391 is about 19691.9879900431. The cubic root of 387774391 is about 729.2219087936.

The spelling of 387774391 in words is "three hundred eighty-seven million, seven hundred seventy-four thousand, three hundred ninety-one".