1291930 has 8 divisors (see below), whose sum is σ = 2325492. Its totient is φ = 516768.

The previous prime is 1291909. The next prime is 1291931. The reversal of 1291930 is 391921.

It can be written as a sum of positive squares in 2 ways, for example, as 1279161 + 12769 = 1131^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1291895 and 1291904.

It is not an unprimeable number, because it can be changed into a prime (1291931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64587 + ... + 64606.

2^1291930 is an apocalyptic number.

1291930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291930 is a deficient number, since it is larger than the sum of its proper divisors (1033562).

1291930 is a wasteful number, since it uses less digits than its factorization.

1291930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129200.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1291930 is about 1136.6309867323. The cubic root of 1291930 is about 108.9129850109.

Subtracting from 1291930 its reverse (391921), we obtain a palindrome (900009).

The spelling of 1291930 in words is "one million, two hundred ninety-one thousand, nine hundred thirty".