1394027820 has 144 divisors (see below), whose sum is σ = 4402638240. Its totient is φ = 370262016.

The previous prime is 1394027813. The next prime is 1394027903. The reversal of 1394027820 is 287204931.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1812396 + ... + 1813164.

Almost surely, 2^1394027820 is an apocalyptic number.

1394027820 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 1394027820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2201319120).

1394027820 is an abundant number, since it is smaller than the sum of its proper divisors (3008610420).

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

1394027820 is a wasteful number, since it uses less digits than its factorization.

1394027820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1394027820 is about 37336.6819629168. The cubic root of 1394027820 is about 1117.0959577116.

The spelling of 1394027820 in words is "one billion, three hundred ninety-four million, twenty-seven thousand, eight hundred twenty".