1423811820 has 24 divisors (see below), whose sum is σ = 3986673264. Its totient is φ = 379683136.

The previous prime is 1423811813. The next prime is 1423811821. The reversal of 1423811820 is 281183241.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1423811821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11865039 + ... + 11865158.

It is an arithmetic number, because the mean of its divisors is an integer number (166111386).

Almost surely, 2^1423811820 is an apocalyptic number.

1423811820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423811820 is an abundant number, since it is smaller than the sum of its proper divisors (2562861444).

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

1423811820 is a wasteful number, since it uses less digits than its factorization.

1423811820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23730209 (or 23730207 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1423811820 is about 37733.4310658334. The cubic root of 1423811820 is about 1124.9957056626.

The spelling of 1423811820 in words is "one billion, four hundred twenty-three million, eight hundred eleven thousand, eight hundred twenty".