421620739 has 4 divisors (see below), whose sum is σ = 435221440. Its totient is φ = 408020040.

The previous prime is 421620733. The next prime is 421620769. The reversal of 421620739 is 937026124.

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

It is a cyclic number.

It is not a de Polignac number, because 421620739 - 2¹³ = 421612547 is a prime.

It is a super-2 number, since 2×421620739² = 355528095109812242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421620733) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6800304 + ... + 6800365.

It is an arithmetic number, because the mean of its divisors is an integer number (108805360).

Almost surely, 2^421620739 is an apocalyptic number.

421620739 is a deficient number, since it is larger than the sum of its proper divisors (13600701).

421620739 is a wasteful number, since it uses less digits than its factorization.

421620739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13600700.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 421620739 is about 20533.4054408907. The cubic root of 421620739 is about 749.8492965348.

The spelling of 421620739 in words is "four hundred twenty-one million, six hundred twenty thousand, seven hundred thirty-nine".