1387726928 has 20 divisors (see below), whose sum is σ = 3072824160. Its totient is φ = 594740064.

The previous prime is 1387726927. The next prime is 1387726957. The reversal of 1387726928 is 8296277831.

It is a self number, because there is not a number n which added to its sum of digits gives 1387726928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387726927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6195098 + ... + 6195321.

It is an arithmetic number, because the mean of its divisors is an integer number (153641208).

Almost surely, 2^1387726928 is an apocalyptic number.

It is an amenable number.

1387726928 is an abundant number, since it is smaller than the sum of its proper divisors (1685097232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1387726928 is a wasteful number, since it uses less digits than its factorization.

1387726928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12390434 (or 12390428 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 53.

The square root of 1387726928 is about 37252.2070218665. The cubic root of 1387726928 is about 1115.4103546993.

The spelling of 1387726928 in words is "one billion, three hundred eighty-seven million, seven hundred twenty-six thousand, nine hundred twenty-eight".