1387776 has 72 divisors (see below), whose sum is σ = 4006240. Its totient is φ = 423936.

The previous prime is 1387733. The next prime is 1387781. The reversal of 1387776 is 6777831.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9915 + ... + 10053.

2^1387776 is an apocalyptic number.

1387776 is a gapful number since it is divisible by the number (16) 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 1387776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2003120).

1387776 is an abundant number, since it is smaller than the sum of its proper divisors (2618464).

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

1387776 is a wasteful number, since it uses less digits than its factorization.

1387776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 157 counting only the distinct ones).

The product of its digits is 49392, while the sum is 39.

The square root of 1387776 is about 1178.0390485888. The cubic root of 1387776 is about 111.5423502044.

The spelling of 1387776 in words is "one million, three hundred eighty-seven thousand, seven hundred seventy-six".