420440542 has 4 divisors (see below), whose sum is σ = 630660816. Its totient is φ = 210220270.

The previous prime is 420440513. The next prime is 420440543. The reversal of 420440542 is 245044024.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420440543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110134 + ... + 105110137.

It is an arithmetic number, because the mean of its divisors is an integer number (157665204).

Almost surely, 2^420440542 is an apocalyptic number.

420440542 is a deficient number, since it is larger than the sum of its proper divisors (210220274).

420440542 is a wasteful number, since it uses less digits than its factorization.

420440542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210220273.

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

The square root of 420440542 is about 20504.6468391923. The cubic root of 420440542 is about 749.1489855459.

Adding to 420440542 its reverse (245044024), we get a palindrome (665484566).

The spelling of 420440542 in words is "four hundred twenty million, four hundred forty thousand, five hundred forty-two".