1909291242 has 16 divisors (see below), whose sum is σ = 3921787872. Its totient is φ = 619229520.

The previous prime is 1909291217. The next prime is 1909291243. The reversal of 1909291242 is 2421929091.

It is a self number, because there is not a number n which added to its sum of digits gives 1909291242.

It is not an unprimeable number, because it can be changed into a prime (1909291243) 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, 4299984 + ... + 4300427.

It is an arithmetic number, because the mean of its divisors is an integer number (245111742).

Almost surely, 2^1909291242 is an apocalyptic number.

1909291242 is an abundant number, since it is smaller than the sum of its proper divisors (2012496630).

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

1909291242 is a wasteful number, since it uses less digits than its factorization.

1909291242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8600453.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 1909291242 is about 43695.4373132939. The cubic root of 1909291242 is about 1240.5779568159.

The spelling of 1909291242 in words is "one billion, nine hundred nine million, two hundred ninety-one thousand, two hundred forty-two".