1399673280 has 112 divisors (see below), whose sum is σ = 4637251584. Its totient is φ = 357012480.

The previous prime is 1399673279. The next prime is 1399673309. The reversal of 1399673280 is 823769931.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 9616 + ... + 53775.

It is an arithmetic number, because the mean of its divisors is an integer number (41404032).

Almost surely, 2^1399673280 is an apocalyptic number.

1399673280 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 1399673280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2318625792).

1399673280 is an abundant number, since it is smaller than the sum of its proper divisors (3237578304).

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

1399673280 is a wasteful number, since it uses less digits than its factorization.

1399673280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63434 (or 63424 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 1399673280 is about 37412.2076333381. The cubic root of 1399673280 is about 1118.6019119654.

The spelling of 1399673280 in words is "one billion, three hundred ninety-nine million, six hundred seventy-three thousand, two hundred eighty".