19979242 has 8 divisors (see below), whose sum is σ = 30064356. Its totient is φ = 9957792.

The previous prime is 19979237. The next prime is 19979243. The reversal of 19979242 is 24297991.

It can be written as a sum of positive squares in 2 ways, for example, as 12737761 + 7241481 = 3569^2 + 2691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19979242² = 798340221789128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19979243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15123 + ... + 16390.

Almost surely, 2^19979242 is an apocalyptic number.

19979242 is a deficient number, since it is larger than the sum of its proper divisors (10085114).

19979242 is a wasteful number, since it uses less digits than its factorization.

19979242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31832.

The product of its digits is 81648, while the sum is 43.

The square root of 19979242 is about 4469.8145375396. The cubic root of 19979242 is about 271.3478193496.

The spelling of 19979242 in words is "nineteen million, nine hundred seventy-nine thousand, two hundred forty-two".