423777434989 has 4 divisors (see below), whose sum is σ = 423789665824. Its totient is φ = 423765204156.

The previous prime is 423777434963. The next prime is 423777435001. The reversal of 423777434989 is 989434777324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 423777434989 - 2²¹ = 423775337837 is a prime.

It is a super-2 number, since 2×423777434989² (a number of 24 digits) 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 (423777434909) 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, 6063297 + ... + 6132790.

It is an arithmetic number, because the mean of its divisors is an integer number (105947416456).

Almost surely, 2^423777434989 is an apocalyptic number.

It is an amenable number.

423777434989 is a deficient number, since it is larger than the sum of its proper divisors (12230835).

423777434989 is a wasteful number, since it uses less digits than its factorization.

423777434989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12230834.

The product of its digits is 256048128, while the sum is 67.

The spelling of 423777434989 in words is "four hundred twenty-three billion, seven hundred seventy-seven million, four hundred thirty-four thousand, nine hundred eighty-nine".