19371989 has 16 divisors (see below), whose sum is σ = 23987712. Its totient is φ = 15234048.

The previous prime is 19371983. The next prime is 19371991. The reversal of 19371989 is 98917391.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19371989 - 2⁸ = 19371733 is a prime.

It is a super-2 number, since 2×19371989² = 750547915632242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19371983) 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, 17012 + ... + 18114.

It is an arithmetic number, because the mean of its divisors is an integer number (1499232).

Almost surely, 2^19371989 is an apocalyptic number.

It is an amenable number.

19371989 is a deficient number, since it is larger than the sum of its proper divisors (4615723).

19371989 is a wasteful number, since it uses less digits than its factorization.

With its successor (19371990) it forms an eRAP, since the sums of their prime factors are consecutive (1316 and 1317).

19371989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316.

The product of its digits is 122472, while the sum is 47.

The square root of 19371989 is about 4401.3621755089. The cubic root of 19371989 is about 268.5703537838.

The spelling of 19371989 in words is "nineteen million, three hundred seventy-one thousand, nine hundred eighty-nine".