19764897 has 16 divisors (see below), whose sum is σ = 28005120. Its totient is φ = 12356352.

The previous prime is 19764893. The next prime is 19764923. The reversal of 19764897 is 79846791.

It is not a de Polignac number, because 19764897 - 2² = 19764893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (19764893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18504 + ... + 19542.

It is an arithmetic number, because the mean of its divisors is an integer number (1750320).

Almost surely, 2^19764897 is an apocalyptic number.

19764897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19764897 is a deficient number, since it is larger than the sum of its proper divisors (8240223).

19764897 is a wasteful number, since it uses less digits than its factorization.

19764897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 762048, while the sum is 51.

The square root of 19764897 is about 4445.7729361721. The cubic root of 19764897 is about 270.3739537091.

The spelling of 19764897 in words is "nineteen million, seven hundred sixty-four thousand, eight hundred ninety-seven".