1399878720 has 448 divisors, whose sum is σ = 5281574400. Its totient is φ = 348364800.

The previous prime is 1399878661. The next prime is 1399878731. The reversal of 1399878720 is 278789931.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9270645 + ... + 9270795.

Almost surely, 2^1399878720 is an apocalyptic number.

1399878720 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 1399878720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2640787200).

1399878720 is an abundant number, since it is smaller than the sum of its proper divisors (3881695680).

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

1399878720 is a wasteful number, since it uses less digits than its factorization.

1399878720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 1399878720 is about 37414.9531604678. The cubic root of 1399878720 is about 1118.6566376736.

The spelling of 1399878720 in words is "one billion, three hundred ninety-nine million, eight hundred seventy-eight thousand, seven hundred twenty".