1387651264 has 56 divisors (see below), whose sum is σ = 2882774016. Its totient is φ = 661920000.

The previous prime is 1387651261. The next prime is 1387651289. The reversal of 1387651264 is 4621567831.

It is a self number, because there is not a number n which added to its sum of digits gives 1387651264.

It is not an unprimeable number, because it can be changed into a prime (1387651261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135939 + ... + 145789.

Almost surely, 2^1387651264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387651264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441387008).

1387651264 is an abundant number, since it is smaller than the sum of its proper divisors (1495122752).

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

1387651264 is an equidigital number, since it uses as much as digits as its factorization.

1387651264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9965 (or 9955 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 1387651264 is about 37251.1914440330. The cubic root of 1387651264 is about 1115.3900822328.

The spelling of 1387651264 in words is "one billion, three hundred eighty-seven million, six hundred fifty-one thousand, two hundred sixty-four".