1291640046 has 16 divisors (see below), whose sum is σ = 2615980800. Its totient is φ = 425096568.

The previous prime is 1291640039. The next prime is 1291640143. The reversal of 1291640046 is 6400461921.

It is a junction number, because it is equal to n+sod(n) for n = 1291639989 and 1291640016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1362016 + ... + 1362963.

It is an arithmetic number, because the mean of its divisors is an integer number (163498800).

Almost surely, 2^1291640046 is an apocalyptic number.

1291640046 is an abundant number, since it is smaller than the sum of its proper divisors (1324340754).

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

1291640046 is a wasteful number, since it uses less digits than its factorization.

1291640046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725063.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1291640046 is about 35939.3940683479. The cubic root of 1291640046 is about 1089.0483644801.

The spelling of 1291640046 in words is "one billion, two hundred ninety-one million, six hundred forty thousand, forty-six".