19902312 has 48 divisors (see below), whose sum is σ = 54600000. Its totient is φ = 6548256.

The previous prime is 19902299. The next prime is 19902317. The reversal of 19902312 is 21320991.

It is a super-2 number, since 2×19902312² = 792204045890688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19902317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3939 + ... + 7437.

It is an arithmetic number, because the mean of its divisors is an integer number (1137500).

Almost surely, 2^19902312 is an apocalyptic number.

19902312 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 19902312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27300000).

19902312 is an abundant number, since it is smaller than the sum of its proper divisors (34697688).

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

19902312 is a wasteful number, since it uses less digits than its factorization.

19902312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590 (or 3583 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 19902312 is about 4461.2007352281. The cubic root of 19902312 is about 270.9990967776. Note that the first 3 decimals are identical.

The spelling of 19902312 in words is "nineteen million, nine hundred two thousand, three hundred twelve".