42402445 has 4 divisors (see below), whose sum is σ = 50882940. Its totient is φ = 33921952.

The previous prime is 42402431. The next prime is 42402457. The reversal of 42402445 is 54420424.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32046921 + 10355524 = 5661^2 + 3218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42402445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240240 + ... + 4240249.

It is an arithmetic number, because the mean of its divisors is an integer number (12720735).

Almost surely, 2^42402445 is an apocalyptic number.

It is an amenable number.

42402445 is a deficient number, since it is larger than the sum of its proper divisors (8480495).

42402445 is an equidigital number, since it uses as much as digits as its factorization.

42402445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8480494.

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 42402445 is about 6511.7159796785. The cubic root of 42402445 is about 348.7093827818.

Adding to 42402445 its reverse (54420424), we get a palindrome (96822869).

The spelling of 42402445 in words is "forty-two million, four hundred two thousand, four hundred forty-five".