19672981 has 6 divisors (see below), whose sum is σ = 20566070. Its totient is φ = 18817128.

The previous prime is 19672979. The next prime is 19672993. The reversal of 19672981 is 18927691.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 576081 = 4370^2 + 759^2 .

It is not a de Polignac number, because 19672981 - 2¹ = 19672979 is a prime.

It is a super-2 number, since 2×19672981² = 774052362852722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19672951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18066 + ... + 19123.

Almost surely, 2^19672981 is an apocalyptic number.

It is an amenable number.

19672981 is a deficient number, since it is larger than the sum of its proper divisors (893089).

19672981 is an equidigital number, since it uses as much as digits as its factorization.

19672981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37235 (or 37212 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 19672981 is about 4435.4234296175. The cubic root of 19672981 is about 269.9541806107.

The spelling of 19672981 in words is "nineteen million, six hundred seventy-two thousand, nine hundred eighty-one".