1399855440 has 160 divisors (see below), whose sum is σ = 4547137536. Its totient is φ = 355576320.

The previous prime is 1399855439. The next prime is 1399855453. The reversal of 1399855440 is 445589931.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1399855440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2025495 + ... + 2026185.

Almost surely, 2^1399855440 is an apocalyptic number.

1399855440 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 1399855440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2273568768).

1399855440 is an abundant number, since it is smaller than the sum of its proper divisors (3147282096).

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

1399855440 is a wasteful number, since it uses less digits than its factorization.

1399855440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1091 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The square root of 1399855440 is about 37414.6420536132. The cubic root of 1399855440 is about 1118.6504365481.

The spelling of 1399855440 in words is "one billion, three hundred ninety-nine million, eight hundred fifty-five thousand, four hundred forty".