11890943999 has 4 divisors (see below), whose sum is σ = 12971938920. Its totient is φ = 10809949080.

The previous prime is 11890943971. The next prime is 11890944001. The reversal of 11890943999 is 99934909811.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11890943999 - 2¹² = 11890939903 is a prime.

It is a super-2 number, since 2×11890943999² (a number of 21 digits) 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 (11890943959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540497444 + ... + 540497465.

It is an arithmetic number, because the mean of its divisors is an integer number (3242984730).

Almost surely, 2^11890943999 is an apocalyptic number.

11890943999 is a deficient number, since it is larger than the sum of its proper divisors (1080994921).

11890943999 is a wasteful number, since it uses less digits than its factorization.

11890943999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080994920.

The product of its (nonzero) digits is 5668704, while the sum is 62.

The spelling of 11890943999 in words is "eleven billion, eight hundred ninety million, nine hundred forty-three thousand, nine hundred ninety-nine".