1721409118 has 16 divisors (see below), whose sum is σ = 3033532656. Its totient is φ = 722269440.

The previous prime is 1721409077. The next prime is 1721409119. The reversal of 1721409118 is 8119041271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721409119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3009171 + ... + 3009742.

It is an arithmetic number, because the mean of its divisors is an integer number (189595791).

Almost surely, 2^1721409118 is an apocalyptic number.

1721409118 is a deficient number, since it is larger than the sum of its proper divisors (1312123538).

1721409118 is a wasteful number, since it uses less digits than its factorization.

1721409118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018939.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1721409118 is about 41489.8676546455. The cubic root of 1721409118 is about 1198.4723890328.

The spelling of 1721409118 in words is "one billion, seven hundred twenty-one million, four hundred nine thousand, one hundred eighteen".