19426421 has 8 divisors (see below), whose sum is σ = 23167104. Its totient is φ = 15927120.

The previous prime is 19426409. The next prime is 19426423. The reversal of 19426421 is 12462491.

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

It is a cyclic number.

It is not a de Polignac number, because 19426421 - 2⁶ = 19426357 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 (19426423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60170 + ... + 60491.

It is an arithmetic number, because the mean of its divisors is an integer number (2895888).

Almost surely, 2^19426421 is an apocalyptic number.

It is an amenable number.

19426421 is a deficient number, since it is larger than the sum of its proper divisors (3740683).

19426421 is a wasteful number, since it uses less digits than its factorization.

19426421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120691.

The product of its digits is 3456, while the sum is 29.

The square root of 19426421 is about 4407.5413781382. The cubic root of 19426421 is about 268.8216642489.

The spelling of 19426421 in words is "nineteen million, four hundred twenty-six thousand, four hundred twenty-one".