420436631 has 4 divisors (see below), whose sum is σ = 420831000. Its totient is φ = 420042264.

The previous prime is 420436613. The next prime is 420436637. The reversal of 420436631 is 136634024.

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 420436631 - 2⁶ = 420436567 is a prime.

It is a super-2 number, since 2×420436631² = 353533921373260322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420436594 and 420436603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420436637) 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, 195581 + ... + 197718.

It is an arithmetic number, because the mean of its divisors is an integer number (105207750).

Almost surely, 2^420436631 is an apocalyptic number.

420436631 is a deficient number, since it is larger than the sum of its proper divisors (394369).

420436631 is a wasteful number, since it uses less digits than its factorization.

420436631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394368.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 420436631 is about 20504.5514703443. The cubic root of 420436631 is about 749.1466626405.

The spelling of 420436631 in words is "four hundred twenty million, four hundred thirty-six thousand, six hundred thirty-one".