40997729 has 4 divisors (see below), whose sum is σ = 41420484. Its totient is φ = 40574976.

The previous prime is 40997689. The next prime is 40997777. The reversal of 40997729 is 92779904.

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 29593600 + 11404129 = 5440^2 + 3377^2 .

It is a cyclic number.

It is not a de Polignac number, because 40997729 - 2¹² = 40993633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40997029) 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, 211232 + ... + 211425.

It is an arithmetic number, because the mean of its divisors is an integer number (10355121).

Almost surely, 2^40997729 is an apocalyptic number.

It is an amenable number.

40997729 is a deficient number, since it is larger than the sum of its proper divisors (422755).

40997729 is an equidigital number, since it uses as much as digits as its factorization.

40997729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422754.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 40997729 is about 6402.9468996705. The cubic root of 40997729 is about 344.8153573343.

The spelling of 40997729 in words is "forty million, nine hundred ninety-seven thousand, seven hundred twenty-nine".