19426428 has 72 divisors (see below), whose sum is σ = 56655872. Its totient is φ = 5497632.

The previous prime is 19426423. The next prime is 19426439. The reversal of 19426428 is 82462491.

19426428 is a `hidden beast` number, since 1 + 9 + 4 + 2 + 642 + 8 = 666.

It is a super-2 number, since 2×19426428² = 754772209678368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 19426392 and 19426401.

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 23 ways as a sum of consecutive naturals, for example, 31701 + ... + 32307.

Almost surely, 2^19426428 is an apocalyptic number.

19426428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19426428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28327936).

19426428 is an abundant number, since it is smaller than the sum of its proper divisors (37229444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19426428 is a wasteful number, since it uses less digits than its factorization.

19426428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 746 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 19426428 is about 4407.5421722316. The cubic root of 19426428 is about 268.8216965374.

The spelling of 19426428 in words is "nineteen million, four hundred twenty-six thousand, four hundred twenty-eight".