19940312 has 16 divisors (see below), whose sum is σ = 42729360. Its totient is φ = 8545824.

The previous prime is 19940293. The next prime is 19940321. The reversal of 19940312 is 21304991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177983 + ... + 178094.

It is an arithmetic number, because the mean of its divisors is an integer number (2670585).

Almost surely, 2^19940312 is an apocalyptic number.

It is an amenable number.

19940312 is an abundant number, since it is smaller than the sum of its proper divisors (22789048).

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

19940312 is a wasteful number, since it uses less digits than its factorization.

19940312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356090 (or 356086 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 19940312 is about 4465.4576473190. The cubic root of 19940312 is about 271.1714623226.

The spelling of 19940312 in words is "nineteen million, nine hundred forty thousand, three hundred twelve".