19911412 has 6 divisors (see below), whose sum is σ = 34844978. Its totient is φ = 9955704.

The previous prime is 19911389. The next prime is 19911413. The reversal of 19911412 is 21411991.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 9696996 = 3196^2 + 3114^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19911413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488923 + ... + 2488930.

Almost surely, 2^19911412 is an apocalyptic number.

It is an amenable number.

19911412 is a deficient number, since it is larger than the sum of its proper divisors (14933566).

19911412 is a wasteful number, since it uses less digits than its factorization.

19911412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977857 (or 4977855 counting only the distinct ones).

The product of its digits is 648, while the sum is 28.

The square root of 19911412 is about 4462.2205234614. The cubic root of 19911412 is about 271.0403937555.

It can be divided in two parts, 1991 and 1412, that added together give a triangular number (3403 = T₈₂).

The spelling of 19911412 in words is "nineteen million, nine hundred eleven thousand, four hundred twelve".