19400989 has 16 divisors (see below), whose sum is σ = 20641536. Its totient is φ = 18216000.

The previous prime is 19400959. The next prime is 19400999. The reversal of 19400989 is 98900491.

It is a cyclic number.

It is not a de Polignac number, because 19400989 - 2⁷ = 19400861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400929) 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, 192039 + ... + 192139.

It is an arithmetic number, because the mean of its divisors is an integer number (1290096).

Almost surely, 2^19400989 is an apocalyptic number.

It is an amenable number.

19400989 is a deficient number, since it is larger than the sum of its proper divisors (1240547).

19400989 is a wasteful number, since it uses less digits than its factorization.

19400989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19400989 is about 4404.6553781198. The cubic root of 19400989 is about 268.7043041831.

The spelling of 19400989 in words is "nineteen million, four hundred thousand, nine hundred eighty-nine".