1387928263 has 16 divisors (see below), whose sum is σ = 1494512640. Its totient is φ = 1284304896.

The previous prime is 1387928257. The next prime is 1387928287. The reversal of 1387928263 is 3628297831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387928263 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 (1387928293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241123 + ... + 246811.

It is an arithmetic number, because the mean of its divisors is an integer number (93407040).

Almost surely, 2^1387928263 is an apocalyptic number.

1387928263 is a deficient number, since it is larger than the sum of its proper divisors (106584377).

1387928263 is a wasteful number, since it uses less digits than its factorization.

1387928263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946.

The product of its digits is 870912, while the sum is 49.

The square root of 1387928263 is about 37254.9092469704. The cubic root of 1387928263 is about 1115.4642942940.

The spelling of 1387928263 in words is "one billion, three hundred eighty-seven million, nine hundred twenty-eight thousand, two hundred sixty-three".