1399740 has 48 divisors (see below), whose sum is σ = 4021920. Its totient is φ = 363520.

The previous prime is 1399733. The next prime is 1399751. The reversal of 1399740 is 479931.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2176 + ... + 2744.

It is an arithmetic number, because the mean of its divisors is an integer number (83790).

2^1399740 is an apocalyptic number.

1399740 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 1399740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2010960).

1399740 is an abundant number, since it is smaller than the sum of its proper divisors (2622180).

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

1399740 is a wasteful number, since it uses less digits than its factorization.

1399740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 1399740 is about 1183.1060814652. The cubic root of 1399740 is about 111.8619685621.

The spelling of 1399740 in words is "one million, three hundred ninety-nine thousand, seven hundred forty".