1399029840 has 160 divisors (see below), whose sum is σ = 5189667840. Its totient is φ = 344369664.

The previous prime is 1399029781. The next prime is 1399029851. The reversal of 1399029840 is 489209931.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3169 + ... + 52991.

It is an arithmetic number, because the mean of its divisors is an integer number (32435424).

Almost surely, 2^1399029840 is an apocalyptic number.

1399029840 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 1399029840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594833920).

1399029840 is an abundant number, since it is smaller than the sum of its proper divisors (3790638000).

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

1399029840 is a wasteful number, since it uses less digits than its factorization.

1399029840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49858 (or 49846 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1399029840 is about 37403.6073126644. The cubic root of 1399029840 is about 1118.4304758775.

The spelling of 1399029840 in words is "one billion, three hundred ninety-nine million, twenty-nine thousand, eight hundred forty".