2931993 has 6 divisors (see below), whose sum is σ = 4235114. Its totient is φ = 1954656.

The previous prime is 2931983. The next prime is 2931997. The reversal of 2931993 is 3991392.

It can be written as a sum of positive squares in only one way, i.e., 2782224 + 149769 = 1668^2 + 387^2 .

It is not a de Polignac number, because 2931993 - 2⁵ = 2931961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2931997) 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, 162880 + ... + 162897.

2^2931993 is an apocalyptic number.

It is an amenable number.

2931993 is a deficient number, since it is larger than the sum of its proper divisors (1303121).

2931993 is a wasteful number, since it uses less digits than its factorization.

2931993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325783 (or 325780 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 2931993 is about 1712.3063394148. The cubic root of 2931993 is about 143.1268048945.

The spelling of 2931993 in words is "two million, nine hundred thirty-one thousand, nine hundred ninety-three".