40078849 has 2 divisors, whose sum is σ = 40078850. Its totient is φ = 40078848.

The previous prime is 40078823. The next prime is 40078897. The reversal of 40078849 is 94887004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23619600 + 16459249 = 4860^2 + 4057^2 .

It is a cyclic number.

It is not a de Polignac number, because 40078849 - 2⁷ = 40078721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40078249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20039424 + 20039425.

It is an arithmetic number, because the mean of its divisors is an integer number (20039425).

Almost surely, 2^40078849 is an apocalyptic number.

It is an amenable number.

40078849 is a deficient number, since it is larger than the sum of its proper divisors (1).

40078849 is an equidigital number, since it uses as much as digits as its factorization.

40078849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 40078849 is about 6330.7858122037. The cubic root of 40078849 is about 342.2197583303.

The spelling of 40078849 in words is "forty million, seventy-eight thousand, eight hundred forty-nine".