19931434 has 4 divisors (see below), whose sum is σ = 29897154. Its totient is φ = 9965716.

The previous prime is 19931383. The next prime is 19931447. The reversal of 19931434 is 43413991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43413991 = 1249 ⋅34759.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 3553225 = 4047^2 + 1885^2 .

It is a super-2 number, since 2×19931434² = 794524122592712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19931434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982857 + ... + 4982860.

Almost surely, 2^19931434 is an apocalyptic number.

19931434 is a deficient number, since it is larger than the sum of its proper divisors (9965720).

19931434 is an equidigital number, since it uses as much as digits as its factorization.

19931434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9965719.

The product of its digits is 11664, while the sum is 34.

The square root of 19931434 is about 4464.4634616043. The cubic root of 19931434 is about 271.1312119056.

The spelling of 19931434 in words is "nineteen million, nine hundred thirty-one thousand, four hundred thirty-four".