1405405020 has 24 divisors (see below), whose sum is σ = 3935134224. Its totient is φ = 374774656.

The previous prime is 1405405019. The next prime is 1405405031. The reversal of 1405405020 is 205045041.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11711649 + ... + 11711768.

It is an arithmetic number, because the mean of its divisors is an integer number (163963926).

Almost surely, 2^1405405020 is an apocalyptic number.

1405405020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405405020 is an abundant number, since it is smaller than the sum of its proper divisors (2529729204).

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

1405405020 is a wasteful number, since it uses less digits than its factorization.

1405405020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23423429 (or 23423427 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1405405020 is about 37488.7319070678. The cubic root of 1405405020 is about 1120.1267447975.

The spelling of 1405405020 in words is "one billion, four hundred five million, four hundred five thousand, twenty".