423740 has 12 divisors (see below), whose sum is σ = 889896. Its totient is φ = 169488.

The previous prime is 423727. The next prime is 423749. The reversal of 423740 is 47324.

It is a happy number.

423740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 21187 = 423740 / (4 + 2 + 3 + 7 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423749) 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, 10574 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (74158).

2⁴²³⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

423740 is an abundant number, since it is smaller than the sum of its proper divisors (466156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423740 is a wasteful number, since it uses less digits than its factorization.

423740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21196 (or 21194 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 423740 is about 650.9531473155. The cubic root of 423740 is about 75.1103560594.

It can be divided in two parts, 42 and 3740, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 423740 in words is "four hundred twenty-three thousand, seven hundred forty", and thus it is an iban number.