42120403 has 4 divisors (see below), whose sum is σ = 45360448. Its totient is φ = 38880360.

The previous prime is 42120391. The next prime is 42120409. The reversal of 42120403 is 30402124.

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

It is a cyclic number.

It is not a de Polignac number, because 42120403 - 2¹³ = 42112211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120409) 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, 1620003 + ... + 1620028.

It is an arithmetic number, because the mean of its divisors is an integer number (11340112).

Almost surely, 2^42120403 is an apocalyptic number.

42120403 is a deficient number, since it is larger than the sum of its proper divisors (3240045).

42120403 is a wasteful number, since it uses less digits than its factorization.

42120403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240044.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42120403 is about 6490.0233435636. The cubic root of 42120403 is about 347.9345095195.

Adding to 42120403 its reverse (30402124), we get a palindrome (72522527).

The spelling of 42120403 in words is "forty-two million, one hundred twenty thousand, four hundred three".