19420401 has 64 divisors (see below), whose sum is σ = 36126720. Its totient is φ = 8951040.

The previous prime is 19420399. The next prime is 19420411. The reversal of 19420401 is 10402491.

It is not a de Polignac number, because 19420401 - 2¹ = 19420399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19420411) 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 63 ways as a sum of consecutive naturals, for example, 86976 + ... + 87198.

It is an arithmetic number, because the mean of its divisors is an integer number (564480).

Almost surely, 2^19420401 is an apocalyptic number.

19420401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19420401 is a deficient number, since it is larger than the sum of its proper divisors (16706319).

19420401 is a wasteful number, since it uses less digits than its factorization.

19420401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 19420401 is about 4406.8584048049. The cubic root of 19420401 is about 268.7938932454.

Adding to 19420401 its reverse (10402491), we get a palindrome (29822892).

The spelling of 19420401 in words is "nineteen million, four hundred twenty thousand, four hundred one".