1386276640 has 144 divisors (see below), whose sum is σ = 3838290624. Its totient is φ = 471744000.

The previous prime is 1386276637. The next prime is 1386276653. The reversal of 1386276640 is 466726831.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1183255 + ... + 1184425.

It is an arithmetic number, because the mean of its divisors is an integer number (26654796).

Almost surely, 2^1386276640 is an apocalyptic number.

1386276640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1386276640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1919145312).

1386276640 is an abundant number, since it is smaller than the sum of its proper divisors (2452013984).

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

1386276640 is a wasteful number, since it uses less digits than its factorization.

1386276640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1336 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 1386276640 is about 37232.7361336768. The cubic root of 1386276640 is about 1115.0216542813.

The spelling of 1386276640 in words is "one billion, three hundred eighty-six million, two hundred seventy-six thousand, six hundred forty".