40381723 has 2 divisors, whose sum is σ = 40381724. Its totient is φ = 40381722.

The previous prime is 40381673. The next prime is 40381729. The reversal of 40381723 is 32718304.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40381723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40381691 and 40381700.

It is not a weakly prime, because it can be changed into another prime (40381729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20190861 + 20190862.

It is an arithmetic number, because the mean of its divisors is an integer number (20190862).

Almost surely, 2^40381723 is an apocalyptic number.

40381723 is a deficient number, since it is larger than the sum of its proper divisors (1).

40381723 is an equidigital number, since it uses as much as digits as its factorization.

40381723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40381723 is about 6354.6615173430. The cubic root of 40381723 is about 343.0796421918.

The spelling of 40381723 in words is "forty million, three hundred eighty-one thousand, seven hundred twenty-three".