19726483401 has 9 divisors (see below), whose sum is σ = 28494417991. Its totient is φ = 13150708032.

The previous prime is 19726483391. The next prime is 19726483489. The reversal of 19726483401 is 10438462791.

The square root of 19726483401 is 140451.

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

It can be written as a sum of positive squares in only one way, i.e., 14795073225 + 4931410176 = 121635^2 + 70224^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 19726483401 - 2⁵ = 19726483369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19726483901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 397945 + ... + 444761.

Almost surely, 2^19726483401 is an apocalyptic number.

19726483401 is the 140451-st square number.

19726483401 is the 70226-th centered octagonal number.

It is an amenable number.

19726483401 is a deficient number, since it is larger than the sum of its proper divisors (8767934590).

19726483401 is an frugal number, since it uses more digits than its factorization.

19726483401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93640 (or 46820 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 19726483401 in words is "nineteen billion, seven hundred twenty-six million, four hundred eighty-three thousand, four hundred one".