387878257 has 8 divisors (see below), whose sum is σ = 418420800. Its totient is φ = 357436560.

The previous prime is 387878237. The next prime is 387878269. The reversal of 387878257 is 752878783.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 387878257 - 2¹⁵ = 387845489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 387878198 and 387878207.

It is not an unprimeable number, because it can be changed into a prime (387878207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17119 + ... + 32692.

It is an arithmetic number, because the mean of its divisors is an integer number (52302600).

Almost surely, 2^387878257 is an apocalyptic number.

It is an amenable number.

387878257 is a deficient number, since it is larger than the sum of its proper divisors (30542543).

387878257 is a wasteful number, since it uses less digits than its factorization.

387878257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50423.

The product of its digits is 5268480, while the sum is 55.

The square root of 387878257 is about 19694.6250789397. The cubic root of 387878257 is about 729.2870107386.

The spelling of 387878257 in words is "three hundred eighty-seven million, eight hundred seventy-eight thousand, two hundred fifty-seven".