387997877 has 4 divisors (see below), whose sum is σ = 388894380. Its totient is φ = 387101376.

The previous prime is 387997867. The next prime is 387997913. The reversal of 387997877 is 778799783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 778799783 = 5749 ⋅135467.

It can be written as a sum of positive squares in 2 ways, for example, as 156775441 + 231222436 = 12521^2 + 15206^2 .

It is a cyclic number.

It is not a de Polignac number, because 387997877 - 2¹⁶ = 387932341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387997867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447602 + ... + 448467.

It is an arithmetic number, because the mean of its divisors is an integer number (97223595).

Almost surely, 2^387997877 is an apocalyptic number.

It is an amenable number.

387997877 is a deficient number, since it is larger than the sum of its proper divisors (896503).

387997877 is an equidigital number, since it uses as much as digits as its factorization.

387997877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896502.

The product of its digits is 37340352, while the sum is 65.

The square root of 387997877 is about 19697.6617140208. The cubic root of 387997877 is about 729.3619727010.

The spelling of 387997877 in words is "three hundred eighty-seven million, nine hundred ninety-seven thousand, eight hundred seventy-seven".