1721789914 has 48 divisors (see below), whose sum is σ = 2908272600. Its totient is φ = 763246848.

The previous prime is 1721789897. The next prime is 1721789933. The reversal of 1721789914 is 4199871271.

It can be written as a sum of positive squares in 12 ways, for example, as 248535225 + 1473254689 = 15765^2 + 38383^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2636412 + ... + 2637064.

Almost surely, 2^1721789914 is an apocalyptic number.

1721789914 is a deficient number, since it is larger than the sum of its proper divisors (1186482686).

1721789914 is a wasteful number, since it uses less digits than its factorization.

1721789914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 966 counting only the distinct ones).

The product of its digits is 254016, while the sum is 49.

The square root of 1721789914 is about 41494.4564249250. The cubic root of 1721789914 is about 1198.5607545933.

The spelling of 1721789914 in words is "one billion, seven hundred twenty-one million, seven hundred eighty-nine thousand, nine hundred fourteen".