19315642 has 4 divisors (see below), whose sum is σ = 28973466. Its totient is φ = 9657820.

The previous prime is 19315619. The next prime is 19315661. The reversal of 19315642 is 24651391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24651391 = 2663 ⋅9257.

It can be written as a sum of positive squares in only one way, i.e., 15594601 + 3721041 = 3949^2 + 1929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4828909 + ... + 4828912.

Almost surely, 2^19315642 is an apocalyptic number.

19315642 is a deficient number, since it is larger than the sum of its proper divisors (9657824).

19315642 is an equidigital number, since it uses as much as digits as its factorization.

19315642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657823.

The product of its digits is 6480, while the sum is 31.

The square root of 19315642 is about 4394.9564275428. The cubic root of 19315642 is about 268.3097054497.

The spelling of 19315642 in words is "nineteen million, three hundred fifteen thousand, six hundred forty-two".