2009742638 has 4 divisors (see below), whose sum is σ = 3014613960. Its totient is φ = 1004871318.

The previous prime is 2009742611. The next prime is 2009742667. The reversal of 2009742638 is 8362479002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 2009742595 and 2009742604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502435658 + ... + 502435661.

It is an arithmetic number, because the mean of its divisors is an integer number (753653490).

Almost surely, 2^2009742638 is an apocalyptic number.

2009742638 is a deficient number, since it is larger than the sum of its proper divisors (1004871322).

2009742638 is a wasteful number, since it uses less digits than its factorization.

2009742638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004871321.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 2009742638 is about 44830.1532230261. The cubic root of 2009742638 is about 1261.9635626822.

The spelling of 2009742638 in words is "two billion, nine million, seven hundred forty-two thousand, six hundred thirty-eight".