19429966 has 4 divisors (see below), whose sum is σ = 29144952. Its totient is φ = 9714982.

The previous prime is 19429957. The next prime is 19429967. The reversal of 19429966 is 66992491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66992491 = 23 ⋅2912717.

It is a super-2 number, since 2×19429966² = 755047157522312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19429967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4857490 + ... + 4857493.

It is an arithmetic number, because the mean of its divisors is an integer number (7286238).

Almost surely, 2^19429966 is an apocalyptic number.

19429966 is a deficient number, since it is larger than the sum of its proper divisors (9714986).

19429966 is an equidigital number, since it uses as much as digits as its factorization.

19429966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9714985.

The product of its digits is 209952, while the sum is 46.

The square root of 19429966 is about 4407.9435114348. The cubic root of 19429966 is about 268.8380150877.

The spelling of 19429966 in words is "nineteen million, four hundred twenty-nine thousand, nine hundred sixty-six".