1388611 has 12 divisors (see below), whose sum is σ = 1711368. Its totient is φ = 1119552.

The previous prime is 1388603. The next prime is 1388623. The reversal of 1388611 is 1168831.

It is a happy number.

1388611 is a nontrivial binomial coefficient, being equal to C(1667, 2).

It is not a de Polignac number, because 1388611 - 2³ = 1388603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388611.

It is not an unprimeable number, because it can be changed into a prime (1388641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (142614).

2^1388611 is an apocalyptic number.

1388611 is the 1666-th triangular number.

1388611 is the 556-th centered nonagonal number.

1388611 is a deficient number, since it is larger than the sum of its proper divisors (322757).

1388611 is a wasteful number, since it uses less digits than its factorization.

1388611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698 (or 1691 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 1388611 is about 1178.3933978091. The cubic root of 1388611 is about 111.5647167316.

The spelling of 1388611 in words is "one million, three hundred eighty-eight thousand, six hundred eleven".