421903729 has 8 divisors (see below), whose sum is σ = 455496552. Its totient is φ = 388473600.

The previous prime is 421903723. The next prime is 421903733. The reversal of 421903729 is 927309124.

It can be written as a sum of positive squares in 4 ways, for example, as 93315600 + 328588129 = 9660^2 + 18127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421903729 - 2¹⁵ = 421870961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421903723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35254 + ... + 45679.

It is an arithmetic number, because the mean of its divisors is an integer number (56937069).

Almost surely, 2^421903729 is an apocalyptic number.

It is an amenable number.

421903729 is a deficient number, since it is larger than the sum of its proper divisors (33592823).

421903729 is a wasteful number, since it uses less digits than its factorization.

421903729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81347.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 421903729 is about 20540.2952510425. The cubic root of 421903729 is about 750.0170242062.

The spelling of 421903729 in words is "four hundred twenty-one million, nine hundred three thousand, seven hundred twenty-nine".