421739453 has 4 divisors (see below), whose sum is σ = 423581340. Its totient is φ = 419897568.

The previous prime is 421739449. The next prime is 421739467. The reversal of 421739453 is 354937124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 206295769 + 215443684 = 14363^2 + 14678^2 .

It is a cyclic number.

It is not a de Polignac number, because 421739453 - 2² = 421739449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421739443) 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 3 ways as a sum of consecutive naturals, for example, 920600 + ... + 921057.

It is an arithmetic number, because the mean of its divisors is an integer number (105895335).

Almost surely, 2^421739453 is an apocalyptic number.

It is an amenable number.

421739453 is a deficient number, since it is larger than the sum of its proper divisors (1841887).

421739453 is a wasteful number, since it uses less digits than its factorization.

421739453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841886.

The product of its digits is 90720, while the sum is 38.

The square root of 421739453 is about 20536.2959902705. The cubic root of 421739453 is about 749.9196672477.

The spelling of 421739453 in words is "four hundred twenty-one million, seven hundred thirty-nine thousand, four hundred fifty-three".