19942479 has 12 divisors (see below), whose sum is σ = 30500496. Its totient is φ = 12512832.

The previous prime is 19942463. The next prime is 19942487. The reversal of 19942479 is 97424991.

It is a happy number.

It is not a de Polignac number, because 19942479 - 2⁴ = 19942463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19942499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65019 + ... + 65324.

It is an arithmetic number, because the mean of its divisors is an integer number (2541708).

Almost surely, 2^19942479 is an apocalyptic number.

19942479 is a deficient number, since it is larger than the sum of its proper divisors (10558017).

19942479 is a wasteful number, since it uses less digits than its factorization.

19942479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130366 (or 130363 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 19942479 is about 4465.7002810310. The cubic root of 19942479 is about 271.1812850922.

The spelling of 19942479 in words is "nineteen million, nine hundred forty-two thousand, four hundred seventy-nine".