420278623 has 4 divisors (see below), whose sum is σ = 421469568. Its totient is φ = 419087680.

The previous prime is 420278591. The next prime is 420278627. The reversal of 420278623 is 326872024.

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 420278623 - 2⁵ = 420278591 is a prime.

It is a super-2 number, since 2×420278623² = 353268241901552258, 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 (420278627) 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, 594943 + ... + 595648.

It is an arithmetic number, because the mean of its divisors is an integer number (105367392).

Almost surely, 2^420278623 is an apocalyptic number.

420278623 is a deficient number, since it is larger than the sum of its proper divisors (1190945).

420278623 is a wasteful number, since it uses less digits than its factorization.

420278623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190944.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 420278623 is about 20500.6981100644. The cubic root of 420278623 is about 749.0528030757.

The spelling of 420278623 in words is "four hundred twenty million, two hundred seventy-eight thousand, six hundred twenty-three".