40409899529 has 4 divisors (see below), whose sum is σ = 40420833684. Its totient is φ = 40398965376.

The previous prime is 40409899501. The next prime is 40409899531. The reversal of 40409899529 is 92599890404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24063765625 + 16346133904 = 155125^2 + 127852^2 .

It is a cyclic number.

It is not a de Polignac number, because 40409899529 - 2²⁰ = 40408850953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40409893529) 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, 5461532 + ... + 5468925.

It is an arithmetic number, because the mean of its divisors is an integer number (10105208421).

Almost surely, 2^40409899529 is an apocalyptic number.

It is an amenable number.

40409899529 is a deficient number, since it is larger than the sum of its proper divisors (10934155).

40409899529 is a wasteful number, since it uses less digits than its factorization.

40409899529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10934154.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 40409899529 in words is "forty billion, four hundred nine million, eight hundred ninety-nine thousand, five hundred twenty-nine".