11990042 has 4 divisors (see below), whose sum is σ = 17985066. Its totient is φ = 5995020.

The previous prime is 11990023. The next prime is 11990051. The reversal of 11990042 is 24009911.

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

It can be written as a sum of positive squares in only one way, i.e., 10504081 + 1485961 = 3241^2 + 1219^2 .

It is a super-2 number, since 2×11990042² = 287522214323528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11989993 and 11990020.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2997509 + ... + 2997512.

Almost surely, 2^11990042 is an apocalyptic number.

11990042 is a deficient number, since it is larger than the sum of its proper divisors (5995024).

11990042 is an equidigital number, since it uses as much as digits as its factorization.

11990042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5995023.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 11990042 is about 3462.6640033362. The cubic root of 11990042 is about 228.8795028496.

Adding to 11990042 its reverse (24009911), we get a palindrome (35999953).

The spelling of 11990042 in words is "eleven million, nine hundred ninety thousand, forty-two".