42451405 has 4 divisors (see below), whose sum is σ = 50941692. Its totient is φ = 33961120.

The previous prime is 42451393. The next prime is 42451417. The reversal of 42451405 is 50415424.

It is a happy number.

42451405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (42451393) and next prime (42451417).

It can be written as a sum of positive squares in 2 ways, for example, as 9066121 + 33385284 = 3011^2 + 5778^2 .

It is not a de Polignac number, because 42451405 - 2⁵ = 42451373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42451405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4245136 + ... + 4245145.

It is an arithmetic number, because the mean of its divisors is an integer number (12735423).

Almost surely, 2^42451405 is an apocalyptic number.

It is an amenable number.

42451405 is a deficient number, since it is larger than the sum of its proper divisors (8490287).

42451405 is an equidigital number, since it uses as much as digits as its factorization.

42451405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8490286.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 42451405 is about 6515.4742728369. The cubic root of 42451405 is about 348.8435436347.

Adding to 42451405 its reverse (50415424), we get a palindrome (92866829).

The spelling of 42451405 in words is "forty-two million, four hundred fifty-one thousand, four hundred five".