421729812 has 72 divisors (see below), whose sum is σ = 1290010176. Its totient is φ = 113405184.

The previous prime is 421729807. The next prime is 421729837. The reversal of 421729812 is 218927124.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44938 + ... + 53505.

It is an arithmetic number, because the mean of its divisors is an integer number (17916808).

Almost surely, 2^421729812 is an apocalyptic number.

421729812 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

421729812 is an abundant number, since it is smaller than the sum of its proper divisors (868280364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421729812 is a wasteful number, since it uses less digits than its factorization.

421729812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98477 (or 98472 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 421729812 is about 20536.0612581868. The cubic root of 421729812 is about 749.9139527949.

It can be divided in two parts, 42172 and 9812, that added together give a square (51984 = 228²).

The spelling of 421729812 in words is "four hundred twenty-one million, seven hundred twenty-nine thousand, eight hundred twelve".