1387256247 has 64 divisors (see below), whose sum is σ = 2322754560. Its totient is φ = 811907712.

The previous prime is 1387256173. The next prime is 1387256251. The reversal of 1387256247 is 7426527831.

1387256247 is a `hidden beast` number, since 1 + 3 + 87 + 2 + 562 + 4 + 7 = 666.

It is not a de Polignac number, because 1387256247 - 2¹¹ = 1387254199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387256047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1832193 + ... + 1832949.

It is an arithmetic number, because the mean of its divisors is an integer number (36293040).

Almost surely, 2^1387256247 is an apocalyptic number.

1387256247 is a deficient number, since it is larger than the sum of its proper divisors (935498313).

1387256247 is a wasteful number, since it uses less digits than its factorization.

1387256247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1023 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 1387256247 is about 37245.8889946260. Note that the first 3 decimals coincide. The cubic root of 1387256247 is about 1115.2842343468.

The spelling of 1387256247 in words is "one billion, three hundred eighty-seven million, two hundred fifty-six thousand, two hundred forty-seven".