40390723 has 4 divisors (see below), whose sum is σ = 41052928. Its totient is φ = 39728520.

The previous prime is 40390711. The next prime is 40390739. The reversal of 40390723 is 32709304.

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

It is a cyclic number.

It is not a de Polignac number, because 40390723 - 2⁹ = 40390211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40390691 and 40390700.

It is not an unprimeable number, because it can be changed into a prime (40390423) 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, 331011 + ... + 331132.

It is an arithmetic number, because the mean of its divisors is an integer number (10263232).

Almost surely, 2^40390723 is an apocalyptic number.

40390723 is a deficient number, since it is larger than the sum of its proper divisors (662205).

40390723 is an equidigital number, since it uses as much as digits as its factorization.

40390723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662204.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 40390723 is about 6355.3696194635. The cubic root of 40390723 is about 343.1051280403.

The spelling of 40390723 in words is "forty million, three hundred ninety thousand, seven hundred twenty-three".