420973639 has 6 divisors (see below), whose sum is σ = 422194704. Its totient is φ = 419756040.

The previous prime is 420973603. The next prime is 420973681. The reversal of 420973639 is 936379024.

It is not a de Polignac number, because 420973639 - 2²³ = 412585031 is a prime.

It is a super-3 number, since 3×420973639³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420973595 and 420973604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420973339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156274 + ... + 158944.

It is an arithmetic number, because the mean of its divisors is an integer number (70365784).

Almost surely, 2^420973639 is an apocalyptic number.

420973639 is a deficient number, since it is larger than the sum of its proper divisors (1221065).

420973639 is an frugal number, since it uses more digits than its factorization.

420973639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465 (or 3068 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 420973639 is about 20517.6421403630. The cubic root of 420973639 is about 749.4654792888.

The spelling of 420973639 in words is "four hundred twenty million, nine hundred seventy-three thousand, six hundred thirty-nine".