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1138639 is a prime number
BaseRepresentation
bin100010101111111001111
32010211220211
410111333033
5242414024
640223251
712451435
oct4257717
92124824
101138639
11708527
1246ab27
1330b368
14218d55
15177594
hex115fcf

1138639 has 2 divisors, whose sum is σ = 1138640. Its totient is φ = 1138638.

The previous prime is 1138637. The next prime is 1138649. The reversal of 1138639 is 9368311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1138639 - 21 = 1138637 is a prime.

It is a super-3 number, since 3×11386393 = 4428732196850433357, which contains 333 as substring.

Together with 1138637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1138639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569319 + 569320.

It is an arithmetic number, because the mean of its divisors is an integer number (569320).

21138639 is an apocalyptic number.

1138639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138639 is an equidigital number, since it uses as much as digits as its factorization.

1138639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 1138639 is about 1067.0702882191. The cubic root of 1138639 is about 104.4228041865.

The spelling of 1138639 in words is "one million, one hundred thirty-eight thousand, six hundred thirty-nine".