40448069 has 6 divisors (see below), whose sum is σ = 41878290. Its totient is φ = 39020240.

The previous prime is 40448039. The next prime is 40448071. The reversal of 40448069 is 96084404.

It can be written as a sum of positive squares in 3 ways, for example, as 24750625 + 15697444 = 4975^2 + 3962^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40448069 is a prime.

It is a super-2 number, since 2×40448069² = 3272092571657522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40448029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33659 + ... + 34839.

It is an arithmetic number, because the mean of its divisors is an integer number (6979715).

Almost surely, 2^40448069 is an apocalyptic number.

It is an amenable number.

40448069 is a deficient number, since it is larger than the sum of its proper divisors (1430221).

40448069 is an frugal number, since it uses more digits than its factorization.

40448069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 40448069 is about 6359.8796372258. The cubic root of 40448069 is about 343.2674293545.

The spelling of 40448069 in words is "forty million, four hundred forty-eight thousand, sixty-nine".