1138638 has 32 divisors (see below), whose sum is σ = 2451456. Its totient is φ = 351648.

The previous prime is 1138637. The next prime is 1138639. The reversal of 1138638 is 8368311.

It is an interprime number because it is at equal distance from previous prime (1138637) and next prime (1138639).

It is an Ulam number.

Its product of digits (3456) is a multiple of the sum of its prime divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4995 + ... + 5217.

It is an arithmetic number, because the mean of its divisors is an integer number (76608).

2^1138638 is an apocalyptic number.

1138638 is an abundant number, since it is smaller than the sum of its proper divisors (1312818).

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

1138638 is a wasteful number, since it uses less digits than its factorization.

1138638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288.

The product of its digits is 3456, while the sum is 30.

The square root of 1138638 is about 1067.0698196463. The cubic root of 1138638 is about 104.4227736170.

The spelling of 1138638 in words is "one million, one hundred thirty-eight thousand, six hundred thirty-eight".