40478393 has 2 divisors, whose sum is σ = 40478394. Its totient is φ = 40478392.

The previous prime is 40478387. The next prime is 40478423. The reversal of 40478393 is 39387404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26543104 + 13935289 = 5152^2 + 3733^2 .

It is a cyclic number.

It is not a de Polignac number, because 40478393 - 2²² = 36284089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40478323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20239196 + 20239197.

It is an arithmetic number, because the mean of its divisors is an integer number (20239197).

Almost surely, 2^40478393 is an apocalyptic number.

It is an amenable number.

40478393 is a deficient number, since it is larger than the sum of its proper divisors (1).

40478393 is an equidigital number, since it uses as much as digits as its factorization.

40478393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 40478393 is about 6362.2631979509. The cubic root of 40478393 is about 343.3531906907.

The spelling of 40478393 in words is "forty million, four hundred seventy-eight thousand, three hundred ninety-three".