420837505 has 8 divisors (see below), whose sum is σ = 550914624. Its totient is φ = 306063600.

The previous prime is 420837497. The next prime is 420837511. The reversal of 420837505 is 505738024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420837505 - 2³ = 420837497 is a prime.

It is a super-2 number, since 2×420837505² = 354208411229250050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3825741 + ... + 3825850.

It is an arithmetic number, because the mean of its divisors is an integer number (68864328).

Almost surely, 2^420837505 is an apocalyptic number.

It is an amenable number.

420837505 is a deficient number, since it is larger than the sum of its proper divisors (130077119).

420837505 is a wasteful number, since it uses less digits than its factorization.

420837505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651607.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 420837505 is about 20514.3243856579. The cubic root of 420837505 is about 749.3846834670.

The spelling of 420837505 in words is "four hundred twenty million, eight hundred thirty-seven thousand, five hundred five".