1390740 has 48 divisors (see below), whose sum is σ = 4195968. Its totient is φ = 342144.

The previous prime is 1390733. The next prime is 1390757. The reversal of 1390740 is 470931.

It is a self number, because there is not a number n which added to its sum of digits gives 1390740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (87416).

2^1390740 is an apocalyptic number.

1390740 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 1390740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2097984).

1390740 is an abundant number, since it is smaller than the sum of its proper divisors (2805228).

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

1390740 is a wasteful number, since it uses less digits than its factorization.

1390740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1390740 is about 1179.2964004015. The cubic root of 1390740 is about 111.6217041329.

The spelling of 1390740 in words is "one million, three hundred ninety thousand, seven hundred forty".