1291735842 has 16 divisors (see below), whose sum is σ = 2600582592. Its totient is φ = 427726800.

The previous prime is 1291735831. The next prime is 1291735903. The reversal of 1291735842 is 2485371921.

It is a junction number, because it is equal to n+sod(n) for n = 1291735794 and 1291735803.

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, 711973 + ... + 713784.

It is an arithmetic number, because the mean of its divisors is an integer number (162536412).

Almost surely, 2^1291735842 is an apocalyptic number.

1291735842 is an abundant number, since it is smaller than the sum of its proper divisors (1308846750).

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

1291735842 is a wasteful number, since it uses less digits than its factorization.

1291735842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425913.

The product of its digits is 120960, while the sum is 42.

The square root of 1291735842 is about 35940.7267873091. The cubic root of 1291735842 is about 1089.0752873313.

The spelling of 1291735842 in words is "one billion, two hundred ninety-one million, seven hundred thirty-five thousand, eight hundred forty-two".