19980312 has 32 divisors (see below), whose sum is σ = 54492480. Its totient is φ = 6054560.

The previous prime is 19980299. The next prime is 19980347. The reversal of 19980312 is 21308991.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37578 + ... + 38105.

It is an arithmetic number, because the mean of its divisors is an integer number (1702890).

Almost surely, 2^19980312 is an apocalyptic number.

19980312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19980312 is an abundant number, since it is smaller than the sum of its proper divisors (34512168).

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

19980312 is a wasteful number, since it uses less digits than its factorization.

19980312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75703 (or 75699 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 19980312 is about 4469.9342277040. The cubic root of 19980312 is about 271.3526633269.

The spelling of 19980312 in words is "nineteen million, nine hundred eighty thousand, three hundred twelve".