1399860 has 144 divisors (see below), whose sum is σ = 5346432. Its totient is φ = 288000.

The previous prime is 1399847. The next prime is 1399861. The reversal of 1399860 is 689931.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13810 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (37128).

2^1399860 is an apocalyptic number.

1399860 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 1399860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2673216).

1399860 is an abundant number, since it is smaller than the sum of its proper divisors (3946572).

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

1399860 is a wasteful number, since it uses less digits than its factorization.

1399860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1399860 is about 1183.1567943430. The cubic root of 1399860 is about 111.8651651207.

It can be divided in two parts, 139 and 9860, that added together give a palindrome (9999).

The spelling of 1399860 in words is "one million, three hundred ninety-nine thousand, eight hundred sixty".