1721650838 has 16 divisors (see below), whose sum is σ = 2719242240. Its totient is φ = 815265000.

The previous prime is 1721650829. The next prime is 1721650883. The reversal of 1721650838 is 8380561271.

It is a super-2 number, since 2×1721650838² = 5928163215972204488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1721650795 and 1721650804.

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, 183563 + ... + 192713.

It is an arithmetic number, because the mean of its divisors is an integer number (169952640).

Almost surely, 2^1721650838 is an apocalyptic number.

1721650838 is a deficient number, since it is larger than the sum of its proper divisors (997591402).

1721650838 is a wasteful number, since it uses less digits than its factorization.

1721650838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14123.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1721650838 is about 41492.7805527660. The cubic root of 1721650838 is about 1198.5284828427.

The spelling of 1721650838 in words is "one billion, seven hundred twenty-one million, six hundred fifty thousand, eight hundred thirty-eight".