1291406930 has 128 divisors (see below), whose sum is σ = 2730309120. Its totient is φ = 435456000.

The previous prime is 1291406929. The next prime is 1291406939. The reversal of 1291406930 is 396041921.

It is not an unprimeable number, because it can be changed into a prime (1291406939) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11847716 + ... + 11847824.

It is an arithmetic number, because the mean of its divisors is an integer number (21330540).

Almost surely, 2^1291406930 is an apocalyptic number.

1291406930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291406930 is an abundant number, since it is smaller than the sum of its proper divisors (1438902190).

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

1291406930 is a wasteful number, since it uses less digits than its factorization.

1291406930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1291406930 is about 35936.1507398887. The cubic root of 1291406930 is about 1088.9828431625.

The spelling of 1291406930 in words is "one billion, two hundred ninety-one million, four hundred six thousand, nine hundred thirty".