40631993 has 2 divisors, whose sum is σ = 40631994. Its totient is φ = 40631992.

The previous prime is 40631959. The next prime is 40632001. The reversal of 40631993 is 39913604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40347904 + 284089 = 6352^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 40631993 - 2²⁰ = 39583417 is a prime.

It is not a weakly prime, because it can be changed into another prime (40631933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20315996 + 20315997.

It is an arithmetic number, because the mean of its divisors is an integer number (20315997).

Almost surely, 2^40631993 is an apocalyptic number.

It is an amenable number.

40631993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40631993 is an equidigital number, since it uses as much as digits as its factorization.

40631993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 40631993 is about 6374.3229444389. The cubic root of 40631993 is about 343.7869404709.

The spelling of 40631993 in words is "forty million, six hundred thirty-one thousand, nine hundred ninety-three".