19972146 has 16 divisors (see below), whose sum is σ = 39996000. Its totient is φ = 6648768.

The previous prime is 19972111. The next prime is 19972151. The reversal of 19972146 is 64127991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4405 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (2499750).

Almost surely, 2^19972146 is an apocalyptic number.

19972146 is an abundant number, since it is smaller than the sum of its proper divisors (20023854).

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

19972146 is a wasteful number, since it uses less digits than its factorization.

19972146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313.

The product of its digits is 27216, while the sum is 39.

The square root of 19972146 is about 4469.0206980948. The cubic root of 19972146 is about 271.3156908012.

The spelling of 19972146 in words is "nineteen million, nine hundred seventy-two thousand, one hundred forty-six".