40405329 has 6 divisors (see below), whose sum is σ = 58363266. Its totient is φ = 26936880.

The previous prime is 40405237. The next prime is 40405331. The reversal of 40405329 is 92350404.

It can be written as a sum of positive squares in only one way, i.e., 38155329 + 2250000 = 6177^2 + 1500^2 .

It is not a de Polignac number, because 40405329 - 2⁹ = 40404817 is a prime.

It is a super-2 number, since 2×40405329² = 3265181223196482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40405349) 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, 2244732 + ... + 2244749.

It is an arithmetic number, because the mean of its divisors is an integer number (9727211).

Almost surely, 2^40405329 is an apocalyptic number.

It is an amenable number.

40405329 is a deficient number, since it is larger than the sum of its proper divisors (17957937).

40405329 is a wasteful number, since it uses less digits than its factorization.

40405329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489487 (or 4489484 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 40405329 is about 6356.5186226424. The cubic root of 40405329 is about 343.1464806841.

The spelling of 40405329 in words is "forty million, four hundred five thousand, three hundred twenty-nine".