1387057857 has 8 divisors (see below), whose sum is σ = 1850330976. Its totient is φ = 924244992.

The previous prime is 1387057759. The next prime is 1387057871. The reversal of 1387057857 is 7587507831.

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

It is not a de Polignac number, because 1387057857 - 2⁸ = 1387057601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387057657) 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, 107968 + ... + 120129.

It is an arithmetic number, because the mean of its divisors is an integer number (231291372).

Almost surely, 2^1387057857 is an apocalyptic number.

It is an amenable number.

1387057857 is a deficient number, since it is larger than the sum of its proper divisors (463273119).

1387057857 is a wasteful number, since it uses less digits than its factorization.

1387057857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230127.

The product of its (nonzero) digits is 1646400, while the sum is 51.

The square root of 1387057857 is about 37243.2256524593. The cubic root of 1387057857 is about 1115.2310666190.

The spelling of 1387057857 in words is "one billion, three hundred eighty-seven million, fifty-seven thousand, eight hundred fifty-seven".