421191739 has 4 divisors (see below), whose sum is σ = 426523360. Its totient is φ = 415860120.

The previous prime is 421191731. The next prime is 421191767. The reversal of 421191739 is 937191124.

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 421191739 - 2³ = 421191731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421191698 and 421191707.

It is not an unprimeable number, because it can be changed into a prime (421191731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665692 + ... + 2665849.

It is an arithmetic number, because the mean of its divisors is an integer number (106630840).

Almost surely, 2^421191739 is an apocalyptic number.

421191739 is a deficient number, since it is larger than the sum of its proper divisors (5331621).

421191739 is an equidigital number, since it uses as much as digits as its factorization.

421191739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331620.

The product of its digits is 13608, while the sum is 37.

The square root of 421191739 is about 20522.9563903449. The cubic root of 421191739 is about 749.5948858086.

The spelling of 421191739 in words is "four hundred twenty-one million, one hundred ninety-one thousand, seven hundred thirty-nine".