23440457 has 2 divisors, whose sum is σ = 23440458. Its totient is φ = 23440456.

The previous prime is 23440441. The next prime is 23440463. The reversal of 23440457 is 75404432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18757561 + 4682896 = 4331^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 23440457 - 2⁴ = 23440441 is a prime.

It is not a weakly prime, because it can be changed into another prime (23440477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11720228 + 11720229.

It is an arithmetic number, because the mean of its divisors is an integer number (11720229).

Almost surely, 2^23440457 is an apocalyptic number.

It is an amenable number.

23440457 is a deficient number, since it is larger than the sum of its proper divisors (1).

23440457 is an equidigital number, since it uses as much as digits as its factorization.

23440457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 23440457 is about 4841.5345707740. The cubic root of 23440457 is about 286.1905954034.

Adding to 23440457 its reverse (75404432), we get a palindrome (98844889).

The spelling of 23440457 in words is "twenty-three million, four hundred forty thousand, four hundred fifty-seven".