11142639 has 6 divisors (see below), whose sum is σ = 16094936. Its totient is φ = 7428420.

The previous prime is 11142631. The next prime is 11142653. The reversal of 11142639 is 93624111.

11142639 is a `hidden beast` number, since 11 + 14 + 2 + 639 = 666.

It is not a de Polignac number, because 11142639 - 2³ = 11142631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11142631) 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 5 ways as a sum of consecutive naturals, for example, 619027 + ... + 619044.

Almost surely, 2^11142639 is an apocalyptic number.

11142639 is a deficient number, since it is larger than the sum of its proper divisors (4952297).

11142639 is a wasteful number, since it uses less digits than its factorization.

11142639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238077 (or 1238074 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 11142639 is about 3338.0591666416. The cubic root of 11142639 is about 223.3551754584.

It can be divided in two parts, 11142 and 639, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 11142639 in words is "eleven million, one hundred forty-two thousand, six hundred thirty-nine".