19929001 has 4 divisors (see below), whose sum is σ = 20571904. Its totient is φ = 19286100.

The previous prime is 19928999. The next prime is 19929031. The reversal of 19929001 is 10092991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10092991 = 151 ⋅66841.

It is a cyclic number.

It is not a de Polignac number, because 19929001 - 2¹ = 19928999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 642871 = 19929001 / (1 + 9 + 9 + 2 + 9 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19929031) 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 3 ways as a sum of consecutive naturals, for example, 321405 + ... + 321466.

It is an arithmetic number, because the mean of its divisors is an integer number (5142976).

Almost surely, 2^19929001 is an apocalyptic number.

It is an amenable number.

19929001 is a deficient number, since it is larger than the sum of its proper divisors (642903).

19929001 is an equidigital number, since it uses as much as digits as its factorization.

19929001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642902.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 19929001 is about 4464.1909681375. The cubic root of 19929001 is about 271.1201792644.

The spelling of 19929001 in words is "nineteen million, nine hundred twenty-nine thousand, one".