1720401818 has 8 divisors (see below), whose sum is σ = 2635509312. Its totient is φ = 841898716.

The previous prime is 1720401811. The next prime is 1720401821. The reversal of 1720401818 is 8181040271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1720401811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9150980 + ... + 9151167.

It is an arithmetic number, because the mean of its divisors is an integer number (329438664).

Almost surely, 2^1720401818 is an apocalyptic number.

1720401818 is a deficient number, since it is larger than the sum of its proper divisors (915107494).

1720401818 is a wasteful number, since it uses less digits than its factorization.

1720401818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18302196.

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 1720401818 is about 41477.7267699183. The cubic root of 1720401818 is about 1198.2385773309.

The spelling of 1720401818 in words is "one billion, seven hundred twenty million, four hundred one thousand, eight hundred eighteen".