19621985 has 8 divisors (see below), whose sum is σ = 24120936. Its totient is φ = 15314560.

The previous prime is 19621969. The next prime is 19622021. The reversal of 19621985 is 58912691.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1157776 + 18464209 = 1076^2 + 4297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19621985 - 2⁴ = 19621969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is an unprimeable number.

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, 47654 + ... + 48063.

It is an arithmetic number, because the mean of its divisors is an integer number (3015117).

Almost surely, 2^19621985 is an apocalyptic number.

It is an amenable number.

19621985 is a deficient number, since it is larger than the sum of its proper divisors (4498951).

19621985 is an equidigital number, since it uses as much as digits as its factorization.

19621985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95763.

The product of its digits is 38880, while the sum is 41.

The square root of 19621985 is about 4429.6709810098. The cubic root of 19621985 is about 269.7207217409.

The spelling of 19621985 in words is "nineteen million, six hundred twenty-one thousand, nine hundred eighty-five".