19725961 has 8 divisors (see below), whose sum is σ = 20349000. Its totient is φ = 19109760.

The previous prime is 19725941. The next prime is 19725983. The reversal of 19725961 is 16952791.

It can be written as a sum of positive squares in 4 ways, for example, as 855625 + 18870336 = 925^2 + 4344^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19725961 - 2⁹ = 19725449 is a prime.

It is a super-2 number, since 2×19725961² = 778227074747042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19725931) 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, 4495 + ... + 7723.

It is an arithmetic number, because the mean of its divisors is an integer number (2543625).

Almost surely, 2^19725961 is an apocalyptic number.

It is an amenable number.

19725961 is a deficient number, since it is larger than the sum of its proper divisors (623039).

19725961 is a wasteful number, since it uses less digits than its factorization.

19725961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419.

The product of its digits is 34020, while the sum is 40.

The square root of 19725961 is about 4441.3917863661. The cubic root of 19725961 is about 270.1962952979.

The spelling of 19725961 in words is "nineteen million, seven hundred twenty-five thousand, nine hundred sixty-one".