19747942 has 4 divisors (see below), whose sum is σ = 29621916. Its totient is φ = 9873970.

The previous prime is 19747919. The next prime is 19747967. The reversal of 19747942 is 24974791.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4936984 + ... + 4936987.

It is an arithmetic number, because the mean of its divisors is an integer number (7405479).

Almost surely, 2^19747942 is an apocalyptic number.

19747942 is a deficient number, since it is larger than the sum of its proper divisors (9873974).

19747942 is an equidigital number, since it uses as much as digits as its factorization.

19747942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9873973.

The product of its digits is 127008, while the sum is 43.

The square root of 19747942 is about 4443.8656595356. The cubic root of 19747942 is about 270.2966196046.

The spelling of 19747942 in words is "nineteen million, seven hundred forty-seven thousand, nine hundred forty-two".