42009401 has 4 divisors (see below), whose sum is σ = 48010752. Its totient is φ = 36008052.

The previous prime is 42009391. The next prime is 42009403. The reversal of 42009401 is 10490024.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42009401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42009403) 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, 3000665 + ... + 3000678.

It is an arithmetic number, because the mean of its divisors is an integer number (12002688).

Almost surely, 2^42009401 is an apocalyptic number.

It is an amenable number.

42009401 is a deficient number, since it is larger than the sum of its proper divisors (6001351).

42009401 is an equidigital number, since it uses as much as digits as its factorization.

42009401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6001350.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 42009401 is about 6481.4659607222. The cubic root of 42009401 is about 347.6285975749.

Adding to 42009401 its reverse (10490024), we get a palindrome (52499425).

The spelling of 42009401 in words is "forty-two million, nine thousand, four hundred one".