40618819 has 2 divisors, whose sum is σ = 40618820. Its totient is φ = 40618818.

The previous prime is 40618813. The next prime is 40618841. The reversal of 40618819 is 91881604.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40618819 - 2¹³ = 40610627 is a prime.

It is a super-2 number, since 2×40618819² = 3299776913909522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40618813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20309409 + 20309410.

It is an arithmetic number, because the mean of its divisors is an integer number (20309410).

Almost surely, 2^40618819 is an apocalyptic number.

40618819 is a deficient number, since it is larger than the sum of its proper divisors (1).

40618819 is an equidigital number, since it uses as much as digits as its factorization.

40618819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 40618819 is about 6373.2894960138. The cubic root of 40618819 is about 343.7497814213.

It can be divided in two parts, 4061 and 8819, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 40618819 in words is "forty million, six hundred eighteen thousand, eight hundred nineteen".