19764969 has 16 divisors (see below), whose sum is σ = 30532992. Its totient is φ = 11138688.

The previous prime is 19764947. The next prime is 19764971. The reversal of 19764969 is 96946791.

It is not a de Polignac number, because 19764969 - 2¹⁵ = 19732201 is a prime.

It is a super-2 number, since 2×19764969² = 781307999141922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19764929) 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, 4914 + ... + 7979.

It is an arithmetic number, because the mean of its divisors is an integer number (1908312).

Almost surely, 2^19764969 is an apocalyptic number.

It is an amenable number.

19764969 is a deficient number, since it is larger than the sum of its proper divisors (10768023).

19764969 is a wasteful number, since it uses less digits than its factorization.

19764969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12976.

The product of its digits is 734832, while the sum is 51.

The square root of 19764969 is about 4445.7810337442. The cubic root of 19764969 is about 270.3742820168.

The spelling of 19764969 in words is "nineteen million, seven hundred sixty-four thousand, nine hundred sixty-nine".