19977212 has 12 divisors (see below), whose sum is σ = 35137200. Its totient is φ = 9938016.

The previous prime is 19977211. The next prime is 19977239. The reversal of 19977212 is 21277991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19977211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11753 + ... + 13344.

It is an arithmetic number, because the mean of its divisors is an integer number (2928100).

Almost surely, 2^19977212 is an apocalyptic number.

It is an amenable number.

19977212 is a deficient number, since it is larger than the sum of its proper divisors (15159988).

19977212 is a wasteful number, since it uses less digits than its factorization.

19977212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25300 (or 25298 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 19977212 is about 4469.5874529983. The cubic root of 19977212 is about 271.3386288987.

The spelling of 19977212 in words is "nineteen million, nine hundred seventy-seven thousand, two hundred twelve".