42409253 has 2 divisors, whose sum is σ = 42409254. Its totient is φ = 42409252.

The previous prime is 42409249. The next prime is 42409261. The reversal of 42409253 is 35290424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25623844 + 16785409 = 5062^2 + 4097^2 .

It is a cyclic number.

It is not a de Polignac number, because 42409253 - 2² = 42409249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42409243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21204626 + 21204627.

It is an arithmetic number, because the mean of its divisors is an integer number (21204627).

Almost surely, 2^42409253 is an apocalyptic number.

It is an amenable number.

42409253 is a deficient number, since it is larger than the sum of its proper divisors (1).

42409253 is an equidigital number, since it uses as much as digits as its factorization.

42409253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 42409253 is about 6512.2387087698. The cubic root of 42409253 is about 348.7280443349.

Adding to 42409253 its reverse (35290424), we get a palindrome (77699677).

The spelling of 42409253 in words is "forty-two million, four hundred nine thousand, two hundred fifty-three".