1721040838 has 24 divisors (see below), whose sum is σ = 2839714920. Its totient is φ = 781704000.

The previous prime is 1721040823. The next prime is 1721040851. The reversal of 1721040838 is 8380401271.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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 in 11 ways as a sum of consecutive naturals, for example, 613038 + ... + 615838.

It is an arithmetic number, because the mean of its divisors is an integer number (118321455).

Almost surely, 2^1721040838 is an apocalyptic number.

1721040838 is a deficient number, since it is larger than the sum of its proper divisors (1118674082).

1721040838 is a wasteful number, since it uses less digits than its factorization.

1721040838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364 (or 5353 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1721040838 is about 41485.4292252111. The cubic root of 1721040838 is about 1198.3869154739.

The spelling of 1721040838 in words is "one billion, seven hundred twenty-one million, forty thousand, eight hundred thirty-eight".