40249819 has 2 divisors, whose sum is σ = 40249820. Its totient is φ = 40249818.

The previous prime is 40249799. The next prime is 40249831. The reversal of 40249819 is 91894204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40249819 is a prime.

It is a super-2 number, since 2×40249819² = 3240095859065522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40249879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20124909 + 20124910.

It is an arithmetic number, because the mean of its divisors is an integer number (20124910).

Almost surely, 2^40249819 is an apocalyptic number.

40249819 is a deficient number, since it is larger than the sum of its proper divisors (1).

40249819 is an equidigital number, since it uses as much as digits as its factorization.

40249819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 40249819 is about 6344.2745054104. The cubic root of 40249819 is about 342.7056863863.

The spelling of 40249819 in words is "forty million, two hundred forty-nine thousand, eight hundred nineteen".