1291106940 has 48 divisors (see below), whose sum is σ = 3648903552. Its totient is φ = 341075776.

The previous prime is 1291106923. The next prime is 1291106953. The reversal of 1291106940 is 496011921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94134 + ... + 106973.

It is an arithmetic number, because the mean of its divisors is an integer number (76018824).

Almost surely, 2^1291106940 is an apocalyptic number.

1291106940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291106940 is an abundant number, since it is smaller than the sum of its proper divisors (2357796612).

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

1291106940 is a wasteful number, since it uses less digits than its factorization.

1291106940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201226 (or 201224 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1291106940 is about 35931.9765668409. The cubic root of 1291106940 is about 1088.8985141374.

The spelling of 1291106940 in words is "one billion, two hundred ninety-one million, one hundred six thousand, nine hundred forty".