1391930 has 16 divisors (see below), whose sum is σ = 2530440. Its totient is φ = 551232.

The previous prime is 1391927. The next prime is 1391933. The reversal of 1391930 is 391931.

It is an interprime number because it is at equal distance from previous prime (1391927) and next prime (1391933).

It can be written as a sum of positive squares in 4 ways, for example, as 1283689 + 108241 = 1133^2 + 329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1391930.

It is not an unprimeable number, because it can be changed into a prime (1391933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452 + ... + 1728.

2^1391930 is an apocalyptic number.

1391930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1391930 is a deficient number, since it is larger than the sum of its proper divisors (1138510).

1391930 is a wasteful number, since it uses less digits than its factorization.

1391930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 1391930 is about 1179.8008306490. The cubic root of 1391930 is about 111.6535317834.

Subtracting from 1391930 its reverse (391931), we obtain a palindrome (999999).

The spelling of 1391930 in words is "one million, three hundred ninety-one thousand, nine hundred thirty".