1309930 has 16 divisors (see below), whose sum is σ = 2439720. Its totient is φ = 505792.

The previous prime is 1309927. The next prime is 1309939. The reversal of 1309930 is 399031.

It can be written as a sum of positive squares in 4 ways, for example, as 619369 + 690561 = 787^2 + 831^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1309895 and 1309904.

It is not an unprimeable number, because it can be changed into a prime (1309939) 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, 1969 + ... + 2548.

2^1309930 is an apocalyptic number.

1309930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1309930 is a deficient number, since it is larger than the sum of its proper divisors (1129790).

1309930 is a wasteful number, since it uses less digits than its factorization.

1309930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 1309930 is about 1144.5217341755. The cubic root of 1309930 is about 109.4164691731.

The spelling of 1309930 in words is "one million, three hundred nine thousand, nine hundred thirty".