421516078 has 16 divisors (see below), whose sum is σ = 660836736. Its totient is φ = 201267000.

The previous prime is 421516061. The next prime is 421516079. The reversal of 421516078 is 870615124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421516079) 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 7 ways as a sum of consecutive naturals, for example, 22453 + ... + 36703.

It is an arithmetic number, because the mean of its divisors is an integer number (41302296).

Almost surely, 2^421516078 is an apocalyptic number.

421516078 is a deficient number, since it is larger than the sum of its proper divisors (239320658).

421516078 is a wasteful number, since it uses less digits than its factorization.

421516078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14919.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 421516078 is about 20530.8567283492. The cubic root of 421516078 is about 749.7872451343.

The spelling of 421516078 in words is "four hundred twenty-one million, five hundred sixteen thousand, seventy-eight".