19420381 has 8 divisors (see below), whose sum is σ = 19951200. Its totient is φ = 18896400.

The previous prime is 19420369. The next prime is 19420397. The reversal of 19420381 is 18302491.

It is a happy number.

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 19420381 - 2⁷ = 19420253 is a prime.

It is a super-2 number, since 2×19420381² = 754302396370322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420321) 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, 4330 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (2493900).

Almost surely, 2^19420381 is an apocalyptic number.

It is an amenable number.

19420381 is a deficient number, since it is larger than the sum of its proper divisors (530819).

19420381 is a wasteful number, since it uses less digits than its factorization.

19420381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 19420381 is about 4406.8561356141. The cubic root of 19420381 is about 268.7938009734.

The spelling of 19420381 in words is "nineteen million, four hundred twenty thousand, three hundred eighty-one".