1420173840 has 80 divisors (see below), whose sum is σ = 4415485248. Its totient is φ = 377599488.

The previous prime is 1420173823. The next prime is 1420173851. The reversal of 1420173840 is 483710241.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a junction number, because it is equal to n+sod(n) for n = 1420173798 and 1420173807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74754 + ... + 91806.

Almost surely, 2^1420173840 is an apocalyptic number.

1420173840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1420173840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2207742624).

1420173840 is an abundant number, since it is smaller than the sum of its proper divisors (2995311408).

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

1420173840 is a wasteful number, since it uses less digits than its factorization.

1420173840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17416 (or 17410 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1420173840 is about 37685.1939095449. The cubic root of 1420173840 is about 1124.0367300130.

The spelling of 1420173840 in words is "one billion, four hundred twenty million, one hundred seventy-three thousand, eight hundred forty".