1291669842 has 16 divisors (see below), whose sum is σ = 2584656000. Its totient is φ = 430337232.

The previous prime is 1291669817. The next prime is 1291669849. The reversal of 1291669842 is 2489661921.

It is a junction number, because it is equal to n+sod(n) for n = 1291669791 and 1291669800.

It is not an unprimeable number, because it can be changed into a prime (1291669849) 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, 41853 + ... + 65840.

It is an arithmetic number, because the mean of its divisors is an integer number (161541000).

Almost surely, 2^1291669842 is an apocalyptic number.

1291669842 is an abundant number, since it is smaller than the sum of its proper divisors (1292986158).

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

1291669842 is a wasteful number, since it uses less digits than its factorization.

1291669842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109697.

The product of its digits is 373248, while the sum is 48.

The square root of 1291669842 is about 35939.8085971531. The cubic root of 1291669842 is about 1089.0567385974.

The spelling of 1291669842 in words is "one billion, two hundred ninety-one million, six hundred sixty-nine thousand, eight hundred forty-two".