11138239 has 10 divisors (see below), whose sum is σ = 12996640. Its totient is φ = 9545004.

The previous prime is 11138203. The next prime is 11138243. The reversal of 11138239 is 93283111.

It is not a de Polignac number, because 11138239 - 2¹³ = 11130047 is a prime.

It is a super-2 number, since 2×11138239² = 248120736042242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11138299) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 82 + ... + 4720.

It is an arithmetic number, because the mean of its divisors is an integer number (1299664).

Almost surely, 2^11138239 is an apocalyptic number.

11138239 is a deficient number, since it is larger than the sum of its proper divisors (1858401).

11138239 is an frugal number, since it uses more digits than its factorization.

11138239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667 (or 4646 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 11138239 is about 3337.4000359561. The cubic root of 11138239 is about 223.3257721259.

The spelling of 11138239 in words is "eleven million, one hundred thirty-eight thousand, two hundred thirty-nine".