11903639 has 4 divisors (see below), whose sum is σ = 12985800. Its totient is φ = 10821480.

The previous prime is 11903579. The next prime is 11903657. The reversal of 11903639 is 93630911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11903639 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 (11903669) 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 3 ways as a sum of consecutive naturals, for example, 541064 + ... + 541085.

It is an arithmetic number, because the mean of its divisors is an integer number (3246450).

Almost surely, 2^11903639 is an apocalyptic number.

11903639 is a deficient number, since it is larger than the sum of its proper divisors (1082161).

11903639 is a wasteful number, since it uses less digits than its factorization.

11903639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082160.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 11903639 is about 3450.1650685148. The cubic root of 11903639 is about 228.3283907976.

The spelling of 11903639 in words is "eleven million, nine hundred three thousand, six hundred thirty-nine".