1723215420369 has 21 divisors (see below), whose sum is σ = 2583694368633. Its totient is φ = 1148786651412.

The previous prime is 1723215420361. The next prime is 1723215420373. The reversal of 1723215420369 is 9630245123271.

It is a happy number.

The square root of 1723215420369 is 1312713.

It is a perfect power (a square), and thus also a powerful number.

1723215420369 is a `hidden beast` number, since 1 + 7 + 2 + 3 + 215 + 420 + 3 + 6 + 9 = 666.

It is not a de Polignac number, because 1723215420369 - 2³ = 1723215420361 is a prime.

It is a super-2 number, since 2×1723215420369² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1723215420361) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 35418942 + ... + 35467560.

It is an arithmetic number, because the mean of its divisors is an integer number (123033065173).

Almost surely, 2^{1723215420369} is an apocalyptic number.

1723215420369 is the 1312713-rd square number.

1723215420369 is the 656357-th centered octagonal number.

It is an amenable number.

1723215420369 is a deficient number, since it is larger than the sum of its proper divisors (860478948264).

1723215420369 is an frugal number, since it uses more digits than its factorization.

1723215420369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97256 (or 48622 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 1723215420369 in words is "one trillion, seven hundred twenty-three billion, two hundred fifteen million, four hundred twenty thousand, three hundred sixty-nine".