1138671 has 16 divisors (see below), whose sum is σ = 1703520. Its totient is φ = 751680.

The previous prime is 1138667. The next prime is 1138673. The reversal of 1138671 is 1768311.

It is not a de Polignac number, because 1138671 - 2² = 1138667 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

1138671 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4771 + ... + 5003.

It is an arithmetic number, because the mean of its divisors is an integer number (106470).

2^1138671 is an apocalyptic number.

1138671 is a deficient number, since it is larger than the sum of its proper divisors (564849).

1138671 is a wasteful number, since it uses less digits than its factorization.

1138671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 417 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 1138671 is about 1067.0852824400. The cubic root of 1138671 is about 104.4237824007.

The spelling of 1138671 in words is "one million, one hundred thirty-eight thousand, six hundred seventy-one".