40669779 has 4 divisors (see below), whose sum is σ = 54226376. Its totient is φ = 27113184.

The previous prime is 40669777. The next prime is 40669793. The reversal of 40669779 is 97796604.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40669779 - 2¹ = 40669777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40669777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6778294 + ... + 6778299.

It is an arithmetic number, because the mean of its divisors is an integer number (13556594).

Almost surely, 2^40669779 is an apocalyptic number.

40669779 is a deficient number, since it is larger than the sum of its proper divisors (13556597).

40669779 is a wasteful number, since it uses less digits than its factorization.

40669779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13556596.

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 40669779 is about 6377.2861783050. The cubic root of 40669779 is about 343.8934764592.

The spelling of 40669779 in words is "forty million, six hundred sixty-nine thousand, seven hundred seventy-nine".