11928731 has 4 divisors (see below), whose sum is σ = 11971464. Its totient is φ = 11886000.

The previous prime is 11928691. The next prime is 11928737. The reversal of 11928731 is 13782911.

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-11928731 is a prime.

It is a super-2 number, since 2×11928731² = 284589246540722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11928737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20945 + ... + 21506.

It is an arithmetic number, because the mean of its divisors is an integer number (2992866).

Almost surely, 2^11928731 is an apocalyptic number.

11928731 is a deficient number, since it is larger than the sum of its proper divisors (42733).

11928731 is an equidigital number, since it uses as much as digits as its factorization.

11928731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42732.

The product of its digits is 3024, while the sum is 32.

The square root of 11928731 is about 3453.7995019978. The cubic root of 11928731 is about 228.4887113825.

The spelling of 11928731 in words is "eleven million, nine hundred twenty-eight thousand, seven hundred thirty-one".