19540971 has 6 divisors (see below), whose sum is σ = 28225860. Its totient is φ = 13027308.

The previous prime is 19540951. The next prime is 19540979. The reversal of 19540971 is 17904591.

It is not a de Polignac number, because 19540971 - 2¹⁴ = 19524587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19540979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1085601 + ... + 1085618.

It is an arithmetic number, because the mean of its divisors is an integer number (4704310).

Almost surely, 2^19540971 is an apocalyptic number.

19540971 is a deficient number, since it is larger than the sum of its proper divisors (8684889).

19540971 is a wasteful number, since it uses less digits than its factorization.

19540971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171225 (or 2171222 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 19540971 is about 4420.5170512057. The cubic root of 19540971 is about 269.3490077974.

The spelling of 19540971 in words is "nineteen million, five hundred forty thousand, nine hundred seventy-one".