40981729 has 2 divisors, whose sum is σ = 40981730. Its totient is φ = 40981728.

The previous prime is 40981693. The next prime is 40981739. The reversal of 40981729 is 92718904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31618129 + 9363600 = 5623^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 40981729 - 2⁷ = 40981601 is a prime.

It is a super-2 number, since 2×40981729² = 3359004223658882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40981691 and 40981700.

It is not a weakly prime, because it can be changed into another prime (40981739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490864 + 20490865.

It is an arithmetic number, because the mean of its divisors is an integer number (20490865).

Almost surely, 2^40981729 is an apocalyptic number.

It is an amenable number.

40981729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40981729 is an equidigital number, since it uses as much as digits as its factorization.

40981729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 40981729 is about 6401.6973530463. The cubic root of 40981729 is about 344.7704949828.

The spelling of 40981729 in words is "forty million, nine hundred eighty-one thousand, seven hundred twenty-nine".