40642769 has 2 divisors, whose sum is σ = 40642770. Its totient is φ = 40642768.

The previous prime is 40642757. The next prime is 40642781. The reversal of 40642769 is 96724604.

It is a balanced prime because it is at equal distance from previous prime (40642757) and next prime (40642781).

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 5121169 = 5960^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 40642769 - 2¹² = 40638673 is a prime.

It is a super-2 number, since 2×40642769² = 3303669343974722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40602769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321384 + 20321385.

It is an arithmetic number, because the mean of its divisors is an integer number (20321385).

Almost surely, 2^40642769 is an apocalyptic number.

It is an amenable number.

40642769 is a deficient number, since it is larger than the sum of its proper divisors (1).

40642769 is an equidigital number, since it uses as much as digits as its factorization.

40642769 is an odious number, because the sum of its binary digits is odd.

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

The square root of 40642769 is about 6375.1681546450. The cubic root of 40642769 is about 343.8173296654.

The spelling of 40642769 in words is "forty million, six hundred forty-two thousand, seven hundred sixty-nine".