19661412 has 24 divisors (see below), whose sum is σ = 47871936. Its totient is φ = 6268768.

The previous prime is 19661387. The next prime is 19661417. The reversal of 19661412 is 21416691.

It is a happy number.

It is a super-2 number, since 2×19661412² = 773142243667488, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19661412.

It is not an unprimeable number, because it can be changed into a prime (19661417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35343 + ... + 35894.

It is an arithmetic number, because the mean of its divisors is an integer number (1994664).

Almost surely, 2^19661412 is an apocalyptic number.

19661412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19661412 is an abundant number, since it is smaller than the sum of its proper divisors (28210524).

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

19661412 is a wasteful number, since it uses less digits than its factorization.

19661412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71267 (or 71265 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 19661412 is about 4434.1190782387. The cubic root of 19661412 is about 269.9012533275.

The spelling of 19661412 in words is "nineteen million, six hundred sixty-one thousand, four hundred twelve".