420669 has 12 divisors (see below), whose sum is σ = 622336. Its totient is φ = 273672.

The previous prime is 420613. The next prime is 420671. The reversal of 420669 is 966024.

It is not a de Polignac number, because 420669 - 2¹² = 416573 is a prime.

It is a super-2 number, since 2×420669² = 353924815122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157 + ... + 930.

2⁴²⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

420669 is a deficient number, since it is larger than the sum of its proper divisors (201667).

420669 is a wasteful number, since it uses less digits than its factorization.

420669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 420669 is about 648.5900091737. The cubic root of 420669 is about 74.9284651252.

It can be divided in two parts, 420 and 669, that added together give a square (1089 = 33²).

The spelling of 420669 in words is "four hundred twenty thousand, six hundred sixty-nine".