19890612 has 72 divisors (see below), whose sum is σ = 60854976. Its totient is φ = 5347584.

The previous prime is 19890593. The next prime is 19890631. The reversal of 19890612 is 21609891.

It is an interprime number because it is at equal distance from previous prime (19890593) and next prime (19890631).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1963 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (845208).

Almost surely, 2^19890612 is an apocalyptic number.

19890612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19890612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30427488).

19890612 is an abundant number, since it is smaller than the sum of its proper divisors (40964364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19890612 is a wasteful number, since it uses less digits than its factorization.

19890612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677 (or 4672 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 19890612 is about 4459.8892362928. The cubic root of 19890612 is about 270.9459821620.

It can be divided in two parts, 19890 and 612, that added together give a palindrome (20502).

The spelling of 19890612 in words is "nineteen million, eight hundred ninety thousand, six hundred twelve".