420434251 has 4 divisors (see below), whose sum is σ = 421392400. Its totient is φ = 419476104.

The previous prime is 420434249. The next prime is 420434279. The reversal of 420434251 is 152434024.

It is a happy number.

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 420434251 - 2¹ = 420434249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420431251) 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, 478416 + ... + 479293.

It is an arithmetic number, because the mean of its divisors is an integer number (105348100).

Almost surely, 2^420434251 is an apocalyptic number.

420434251 is a deficient number, since it is larger than the sum of its proper divisors (958149).

420434251 is an equidigital number, since it uses as much as digits as its factorization.

420434251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958148.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 420434251 is about 20504.4934343670. The cubic root of 420434251 is about 749.1452490526.

Adding to 420434251 its reverse (152434024), we get a palindrome (572868275).

The spelling of 420434251 in words is "four hundred twenty million, four hundred thirty-four thousand, two hundred fifty-one".