421391542 has 32 divisors (see below), whose sum is σ = 753709824. Its totient is φ = 174160800.

The previous prime is 421391539. The next prime is 421391543. The reversal of 421391542 is 245193124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421391543) 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 in 15 ways as a sum of consecutive naturals, for example, 8167 + ... + 30157.

It is an arithmetic number, because the mean of its divisors is an integer number (23553432).

Almost surely, 2^421391542 is an apocalyptic number.

421391542 is a deficient number, since it is larger than the sum of its proper divisors (332318282).

421391542 is a wasteful number, since it uses less digits than its factorization.

421391542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22084.

The product of its digits is 8640, while the sum is 31.

The square root of 421391542 is about 20527.8236060231. The cubic root of 421391542 is about 749.7133968625.

It can be divided in two parts, 42139 and 1542, that added together give a square (43681 = 209²).

The spelling of 421391542 in words is "four hundred twenty-one million, three hundred ninety-one thousand, five hundred forty-two".