40342493 has 4 divisors (see below), whose sum is σ = 40355328. Its totient is φ = 40329660.

The previous prime is 40342481. The next prime is 40342537. The reversal of 40342493 is 39424304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40342493 - 2⁶ = 40342429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40342433) 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, 1838 + ... + 9168.

It is an arithmetic number, because the mean of its divisors is an integer number (10088832).

Almost surely, 2^40342493 is an apocalyptic number.

It is an amenable number.

40342493 is a deficient number, since it is larger than the sum of its proper divisors (12835).

40342493 is an equidigital number, since it uses as much as digits as its factorization.

40342493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12834.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 40342493 is about 6351.5740568776. The cubic root of 40342493 is about 342.9685079616.

Adding to 40342493 its reverse (39424304), we get a palindrome (79766797).

The spelling of 40342493 in words is "forty million, three hundred forty-two thousand, four hundred ninety-three".