19642497 has 16 divisors (see below), whose sum is σ = 31692672. Its totient is φ = 10563840.

The previous prime is 19642477. The next prime is 19642501. The reversal of 19642497 is 79424691.

It is not a de Polignac number, because 19642497 - 2⁸ = 19642241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19642477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27154 + ... + 27867.

It is an arithmetic number, because the mean of its divisors is an integer number (1980792).

Almost surely, 2^19642497 is an apocalyptic number.

19642497 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19642497 is a deficient number, since it is larger than the sum of its proper divisors (12050175).

19642497 is a wasteful number, since it uses less digits than its factorization.

19642497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55048.

The product of its digits is 108864, while the sum is 42.

The square root of 19642497 is about 4431.9856723595. The cubic root of 19642497 is about 269.8146739200.

The spelling of 19642497 in words is "nineteen million, six hundred forty-two thousand, four hundred ninety-seven".