1387446771 has 8 divisors (see below), whose sum is σ = 1867889920. Its totient is φ = 915984072.

The previous prime is 1387446719. The next prime is 1387446791. The reversal of 1387446771 is 1776447831.

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

It is not a de Polignac number, because 1387446771 - 2²⁵ = 1353892339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387446771.

It is not an unprimeable number, because it can be changed into a prime (1387446791) 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, 2244751 + ... + 2245368.

It is an arithmetic number, because the mean of its divisors is an integer number (233486240).

Almost surely, 2^1387446771 is an apocalyptic number.

1387446771 is a deficient number, since it is larger than the sum of its proper divisors (480443149).

1387446771 is a wasteful number, since it uses less digits than its factorization.

1387446771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490225.

The product of its digits is 790272, while the sum is 48.

The square root of 1387446771 is about 37248.4465582123. The cubic root of 1387446771 is about 1115.3352892467.

The spelling of 1387446771 in words is "one billion, three hundred eighty-seven million, four hundred forty-six thousand, seven hundred seventy-one".