11971993 has 8 divisors (see below), whose sum is σ = 13091616. Its totient is φ = 10857600.

The previous prime is 11971991. The next prime is 11972021. The reversal of 11971993 is 39917911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11971993 - 2¹ = 11971991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11971991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4713 + ... + 6793.

It is an arithmetic number, because the mean of its divisors is an integer number (1636452).

Almost surely, 2^11971993 is an apocalyptic number.

It is an amenable number.

11971993 is a deficient number, since it is larger than the sum of its proper divisors (1119623).

11971993 is a wasteful number, since it uses less digits than its factorization.

11971993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615.

The product of its digits is 15309, while the sum is 40.

The square root of 11971993 is about 3460.0567914414. The cubic root of 11971993 is about 228.7645985886.

The spelling of 11971993 in words is "eleven million, nine hundred seventy-one thousand, nine hundred ninety-three".