420347751 has 4 divisors (see below), whose sum is σ = 560463672. Its totient is φ = 280231832.

The previous prime is 420347723. The next prime is 420347783. The reversal of 420347751 is 157743024.

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 420347751 - 2¹⁴ = 420331367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420347791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70057956 + ... + 70057961.

It is an arithmetic number, because the mean of its divisors is an integer number (140115918).

Almost surely, 2^420347751 is an apocalyptic number.

420347751 is a deficient number, since it is larger than the sum of its proper divisors (140115921).

420347751 is a wasteful number, since it uses less digits than its factorization.

420347751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140115920.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 420347751 is about 20502.3840321071. The cubic root of 420347751 is about 749.0938692325.

The spelling of 420347751 in words is "four hundred twenty million, three hundred forty-seven thousand, seven hundred fifty-one".