19747442 has 24 divisors (see below), whose sum is σ = 35068908. Its totient is φ = 8284320.

The previous prime is 19747439. The next prime is 19747447. The reversal of 19747442 is 24474791.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 290521 = 4411^2 + 539^2 .

It is a super-2 number, since 2×19747442² = 779922931086728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19747396 and 19747405.

It is not an unprimeable number, because it can be changed into a prime (19747447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8 + ... + 6284.

Almost surely, 2^19747442 is an apocalyptic number.

19747442 is a deficient number, since it is larger than the sum of its proper divisors (15321466).

19747442 is a wasteful number, since it uses less digits than its factorization.

19747442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6314 (or 6303 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 19747442 is about 4443.8094018533. The cubic root of 19747442 is about 270.2943383635.

The spelling of 19747442 in words is "nineteen million, seven hundred forty-seven thousand, four hundred forty-two".