420956999 has 2 divisors, whose sum is σ = 420957000. Its totient is φ = 420956998.

The previous prime is 420956981. The next prime is 420957001. The reversal of 420956999 is 999659024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420956999 - 2¹⁶ = 420891463 is a prime.

Together with 420957001, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420956999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420956929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210478499 + 210478500.

It is an arithmetic number, because the mean of its divisors is an integer number (210478500).

Almost surely, 2^420956999 is an apocalyptic number.

420956999 is a deficient number, since it is larger than the sum of its proper divisors (1).

420956999 is an equidigital number, since it uses as much as digits as its factorization.

420956999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 420956999 is about 20517.2366316714. The cubic root of 420956999 is about 749.4556043475.

It can be divided in two parts, 42095 and 6999, that added together give a palindrome (49094).

The spelling of 420956999 in words is "four hundred twenty million, nine hundred fifty-six thousand, nine hundred ninety-nine".