1387811 has 4 divisors (see below), whose sum is σ = 1410624. Its totient is φ = 1365000.

The previous prime is 1387807. The next prime is 1387819. The reversal of 1387811 is 1187831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1387811 - 2² = 1387807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387819) 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, 11315 + ... + 11436.

It is an arithmetic number, because the mean of its divisors is an integer number (352656).

2^1387811 is an apocalyptic number.

1387811 is a deficient number, since it is larger than the sum of its proper divisors (22813).

1387811 is an equidigital number, since it uses as much as digits as its factorization.

1387811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22812.

The product of its digits is 1344, while the sum is 29.

The square root of 1387811 is about 1178.0539036903. The cubic root of 1387811 is about 111.5432879036.

The spelling of 1387811 in words is "one million, three hundred eighty-seven thousand, eight hundred eleven".