40135723 has 2 divisors, whose sum is σ = 40135724. Its totient is φ = 40135722.

The previous prime is 40135709. The next prime is 40135741. The reversal of 40135723 is 32753104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40135723 - 2¹⁷ = 40004651 is a prime.

It is a super-2 number, since 2×40135723² = 3221752521465458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40135703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20067861 + 20067862.

It is an arithmetic number, because the mean of its divisors is an integer number (20067862).

Almost surely, 2^40135723 is an apocalyptic number.

40135723 is a deficient number, since it is larger than the sum of its proper divisors (1).

40135723 is an equidigital number, since it uses as much as digits as its factorization.

40135723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 40135723 is about 6335.2760792250. The cubic root of 40135723 is about 342.3815577809.

Adding to 40135723 its reverse (32753104), we get a palindrome (72888827).

The spelling of 40135723 in words is "forty million, one hundred thirty-five thousand, seven hundred twenty-three".