1390076820 has 144 divisors (see below), whose sum is σ = 4616644032. Its totient is φ = 335761920.

The previous prime is 1390076813. The next prime is 1390076869. The reversal of 1390076820 is 286700931.

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

It is a congruent number.

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, 618619 + ... + 620861.

It is an arithmetic number, because the mean of its divisors is an integer number (32060028).

Almost surely, 2^1390076820 is an apocalyptic number.

1390076820 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 1390076820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308322016).

1390076820 is an abundant number, since it is smaller than the sum of its proper divisors (3226567212).

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

1390076820 is a wasteful number, since it uses less digits than its factorization.

1390076820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582 (or 2577 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1390076820 is about 37283.7339868206. The cubic root of 1390076820 is about 1116.0395889143.

The spelling of 1390076820 in words is "one billion, three hundred ninety million, seventy-six thousand, eight hundred twenty".