420706637 has 4 divisors (see below), whose sum is σ = 453068700. Its totient is φ = 388344576.

The previous prime is 420706609. The next prime is 420706669. The reversal of 420706637 is 736607024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 209120521 + 211586116 = 14461^2 + 14546^2 .

It is a cyclic number.

It is not a de Polignac number, because 420706637 - 2⁸ = 420706381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420706597 and 420706606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420706337) 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, 16181012 + ... + 16181037.

It is an arithmetic number, because the mean of its divisors is an integer number (113267175).

Almost surely, 2^420706637 is an apocalyptic number.

It is an amenable number.

420706637 is a deficient number, since it is larger than the sum of its proper divisors (32362063).

420706637 is a wasteful number, since it uses less digits than its factorization.

420706637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32362062.

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 420706637 is about 20511.1344639930. The cubic root of 420706637 is about 749.3069965997.

The spelling of 420706637 in words is "four hundred twenty million, seven hundred six thousand, six hundred thirty-seven".