19499953 has 4 divisors (see below), whose sum is σ = 21272688. Its totient is φ = 17727220.

The previous prime is 19499951. The next prime is 19499959. The reversal of 19499953 is 35999491.

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: 35999491 = 11 ⋅3272681.

It is a cyclic number.

It is not a de Polignac number, because 19499953 - 2¹ = 19499951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19499897 and 19499906.

It is not an unprimeable number, because it can be changed into a prime (19499951) 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, 886351 + ... + 886372.

It is an arithmetic number, because the mean of its divisors is an integer number (5318172).

Almost surely, 2^19499953 is an apocalyptic number.

It is an amenable number.

19499953 is a deficient number, since it is larger than the sum of its proper divisors (1772735).

19499953 is a wasteful number, since it uses less digits than its factorization.

19499953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772734.

The product of its digits is 393660, while the sum is 49.

The square root of 19499953 is about 4415.8751114587. The cubic root of 19499953 is about 269.1604143555.

The spelling of 19499953 in words is "nineteen million, four hundred ninety-nine thousand, nine hundred fifty-three".