40569479 has 2 divisors, whose sum is σ = 40569480. Its totient is φ = 40569478.

The previous prime is 40569469. The next prime is 40569481. The reversal of 40569479 is 97496504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40569479 - 2⁸ = 40569223 is a prime.

Together with 40569481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40569409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20284739 + 20284740.

It is an arithmetic number, because the mean of its divisors is an integer number (20284740).

Almost surely, 2^40569479 is an apocalyptic number.

40569479 is a deficient number, since it is larger than the sum of its proper divisors (1).

40569479 is an equidigital number, since it uses as much as digits as its factorization.

40569479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 40569479 is about 6369.4174772894. The cubic root of 40569479 is about 343.6105398361.

Subtracting 40569479 from its reverse (97496504), we obtain a square (56927025 = 7545²).

The spelling of 40569479 in words is "forty million, five hundred sixty-nine thousand, four hundred seventy-nine".