1390770 has 80 divisors (see below), whose sum is σ = 3998808. Its totient is φ = 345600.

The previous prime is 1390759. The next prime is 1390771. The reversal of 1390770 is 770931.

It can be written as a sum of positive squares in 4 ways, for example, as 1390041 + 729 = 1179^2 + 27^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1390771) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13720 + ... + 13820.

2^1390770 is an apocalyptic number.

1390770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999404).

1390770 is an abundant number, since it is smaller than the sum of its proper divisors (2608038).

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

1390770 is a wasteful number, since it uses less digits than its factorization.

1390770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 1323, while the sum is 27.

The square root of 1390770 is about 1179.3091197816. The cubic root of 1390770 is about 111.6225067337.

The spelling of 1390770 in words is "one million, three hundred ninety thousand, seven hundred seventy".