19725497 has 4 divisors (see below), whose sum is σ = 21518736. Its totient is φ = 17932260.

The previous prime is 19725479. The next prime is 19725527. The reversal of 19725497 is 79452791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79452791 = 11 ⋅7222981.

It is a cyclic number.

It is not a de Polignac number, because 19725497 - 2¹⁰ = 19724473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19725437) 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, 896603 + ... + 896624.

It is an arithmetic number, because the mean of its divisors is an integer number (5379684).

Almost surely, 2^19725497 is an apocalyptic number.

It is an amenable number.

19725497 is a deficient number, since it is larger than the sum of its proper divisors (1793239).

19725497 is a wasteful number, since it uses less digits than its factorization.

19725497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793238.

The product of its digits is 158760, while the sum is 44.

The square root of 19725497 is about 4441.3395501808. The cubic root of 19725497 is about 270.1941767350.

The spelling of 19725497 in words is "nineteen million, seven hundred twenty-five thousand, four hundred ninety-seven".