1797720722 has 18 divisors (see below), whose sum is σ = 3137571783. Its totient is φ = 770271852.

The previous prime is 1797720689. The next prime is 1797720763. The reversal of 1797720722 is 2270277971.

It can be written as a sum of positive squares in only one way, i.e., 898860361 + 898860361 = 29981^2 + 29981^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=29981.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 417593 + ... + 421875.

Almost surely, 2^1797720722 is an apocalyptic number.

1797720722 is a deficient number, since it is larger than the sum of its proper divisors (1339851061).

1797720722 is an frugal number, since it uses more digits than its factorization.

1797720722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8582 (or 4292 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 44.

The square root of 1797720722 is about 42399.5368135078. The cubic root of 1797720722 is about 1215.9267367167.

Multiplying 1797720722 by its product of nonzero digits (172872), we get a square (310775576653584 = 17628828²).

The spelling of 1797720722 in words is "one billion, seven hundred ninety-seven million, seven hundred twenty thousand, seven hundred twenty-two".