1423820 has 12 divisors (see below), whose sum is σ = 2990064. Its totient is φ = 569520.

The previous prime is 1423819. The next prime is 1423843. The reversal of 1423820 is 283241.

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: 71191 = 1423820 / (1 + 4 + 2 + 3 + 8 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1423792 and 1423801.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35576 + ... + 35615.

It is an arithmetic number, because the mean of its divisors is an integer number (249172).

2^1423820 is an apocalyptic number.

1423820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423820 is an abundant number, since it is smaller than the sum of its proper divisors (1566244).

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

1423820 is a wasteful number, since it uses less digits than its factorization.

1423820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71200 (or 71198 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1423820 is about 1193.2392886592. The cubic root of 1423820 is about 112.4997860078.

The spelling of 1423820 in words is "one million, four hundred twenty-three thousand, eight hundred twenty".