2051209340 has 24 divisors (see below), whose sum is σ = 4380551280. Its totient is φ = 806576768.

The previous prime is 2051209327. The next prime is 2051209351. The reversal of 2051209340 is 439021502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867977 + ... + 870336.

It is an arithmetic number, because the mean of its divisors is an integer number (182522970).

Almost surely, 2^2051209340 is an apocalyptic number.

2051209340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2051209340 is an abundant number, since it is smaller than the sum of its proper divisors (2329341940).

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

2051209340 is a wasteful number, since it uses less digits than its factorization.

2051209340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738381 (or 1738379 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2051209340 is about 45290.2786478511. The cubic root of 2051209340 is about 1270.5838429901.

The spelling of 2051209340 in words is "two billion, fifty-one million, two hundred nine thousand, three hundred forty".