421959739 has 2 divisors, whose sum is σ = 421959740. Its totient is φ = 421959738.

The previous prime is 421959709. The next prime is 421959763. The reversal of 421959739 is 937959124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421959739 - 2¹⁹ = 421435451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421959692 and 421959701.

It is not a weakly prime, because it can be changed into another prime (421959709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210979869 + 210979870.

It is an arithmetic number, because the mean of its divisors is an integer number (210979870).

Almost surely, 2^421959739 is an apocalyptic number.

421959739 is a deficient number, since it is larger than the sum of its proper divisors (1).

421959739 is an equidigital number, since it uses as much as digits as its factorization.

421959739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 421959739 is about 20541.6586233926. The cubic root of 421959739 is about 750.0502123419.

The spelling of 421959739 in words is "four hundred twenty-one million, nine hundred fifty-nine thousand, seven hundred thirty-nine".