19989477 has 8 divisors (see below), whose sum is σ = 29614080. Its totient is φ = 13326300.

The previous prime is 19989457. The next prime is 19989481. The reversal of 19989477 is 77498991.

19989477 is a `hidden beast` number, since 1 + 99 + 89 + 477 = 666.

It is not a de Polignac number, because 19989477 - 2⁶ = 19989413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989457) 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 7 ways as a sum of consecutive naturals, for example, 370149 + ... + 370202.

It is an arithmetic number, because the mean of its divisors is an integer number (3701760).

Almost surely, 2^19989477 is an apocalyptic number.

It is an amenable number.

19989477 is a deficient number, since it is larger than the sum of its proper divisors (9624603).

19989477 is an equidigital number, since it uses as much as digits as its factorization.

19989477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740360 (or 740354 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 19989477 is about 4470.9592930377. The cubic root of 19989477 is about 271.3941469467.

It can be divided in two parts, 199 and 89477, that added together give a triangular number (89676 = T₄₂₃).

The spelling of 19989477 in words is "nineteen million, nine hundred eighty-nine thousand, four hundred seventy-seven".