40531993 has 2 divisors, whose sum is σ = 40531994. Its totient is φ = 40531992.

The previous prime is 40531979. The next prime is 40532021. The reversal of 40531993 is 39913504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40106889 + 425104 = 6333^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 40531993 - 2⁹ = 40531481 is a prime.

It is not a weakly prime, because it can be changed into another prime (40531913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20265996 + 20265997.

It is an arithmetic number, because the mean of its divisors is an integer number (20265997).

Almost surely, 2^40531993 is an apocalyptic number.

It is an amenable number.

40531993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40531993 is an equidigital number, since it uses as much as digits as its factorization.

40531993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 40531993 is about 6366.4741419407. The cubic root of 40531993 is about 343.5046757378.

The spelling of 40531993 in words is "forty million, five hundred thirty-one thousand, nine hundred ninety-three".