19420423 has 16 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 17174080.

The previous prime is 19420411. The next prime is 19420439. The reversal of 19420423 is 32402491.

It is a de Polignac number, because none of the positive numbers 2^k-19420423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81138 + ... + 81376.

It is an arithmetic number, because the mean of its divisors is an integer number (1360800).

Almost surely, 2^19420423 is an apocalyptic number.

19420423 is a deficient number, since it is larger than the sum of its proper divisors (2352377).

19420423 is a wasteful number, since it uses less digits than its factorization.

19420423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 19420423 is about 4406.8609009135. The cubic root of 19420423 is about 268.7939947446.

The spelling of 19420423 in words is "nineteen million, four hundred twenty thousand, four hundred twenty-three".