32991993 has 6 divisors (see below), whose sum is σ = 47655114. Its totient is φ = 21994656.

The previous prime is 32991989. The next prime is 32992007. The reversal of 32991993 is 39919923.

It can be written as a sum of positive squares in only one way, i.e., 25522704 + 7469289 = 5052^2 + 2733^2 .

It is not a de Polignac number, because 32991993 - 2² = 32991989 is a prime.

It is a super-2 number, since 2×32991993² = 2176943204224098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (32991983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1832880 + ... + 1832897.

It is an arithmetic number, because the mean of its divisors is an integer number (7942519).

Almost surely, 2^32991993 is an apocalyptic number.

It is an amenable number.

32991993 is a deficient number, since it is larger than the sum of its proper divisors (14663121).

32991993 is a wasteful number, since it uses less digits than its factorization.

32991993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665783 (or 3665780 counting only the distinct ones).

The product of its digits is 118098, while the sum is 45.

The square root of 32991993 is about 5743.8656843628. The cubic root of 32991993 is about 320.7274887523.

The spelling of 32991993 in words is "thirty-two million, nine hundred ninety-one thousand, nine hundred ninety-three".