1399486440 has 128 divisors (see below), whose sum is σ = 4606502400. Its totient is φ = 337317120.

The previous prime is 1399486411. The next prime is 1399486447. The reversal of 1399486440 is 446849931.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1399486440.

It is not an unprimeable number, because it can be changed into a prime (1399486447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233319 + ... + 239241.

It is an arithmetic number, because the mean of its divisors is an integer number (35988300).

Almost surely, 2^1399486440 is an apocalyptic number.

1399486440 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 1399486440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2303251200).

1399486440 is an abundant number, since it is smaller than the sum of its proper divisors (3207015960).

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

1399486440 is a wasteful number, since it uses less digits than its factorization.

1399486440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127 (or 6123 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 1399486440 is about 37409.7105040924. The cubic root of 1399486440 is about 1118.5521363298.

The spelling of 1399486440 in words is "one billion, three hundred ninety-nine million, four hundred eighty-six thousand, four hundred forty".