420690239 has 4 divisors (see below), whose sum is σ = 422327424. Its totient is φ = 419053056.

The previous prime is 420690233. The next prime is 420690241. The reversal of 420690239 is 932096024.

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 420690239 - 2²⁴ = 403913023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420690199 and 420690208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420690233) 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, 818207 + ... + 818720.

It is an arithmetic number, because the mean of its divisors is an integer number (105581856).

Almost surely, 2^420690239 is an apocalyptic number.

420690239 is a deficient number, since it is larger than the sum of its proper divisors (1637185).

420690239 is a wasteful number, since it uses less digits than its factorization.

420690239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637184.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 420690239 is about 20510.7347259917. The cubic root of 420690239 is about 749.2972611572.

The spelling of 420690239 in words is "four hundred twenty million, six hundred ninety thousand, two hundred thirty-nine".