19422840 has 64 divisors (see below), whose sum is σ = 61702560. Its totient is φ = 4874240.

The previous prime is 19422839. The next prime is 19422847. The reversal of 19422840 is 4822491.

19422840 = T₄₆₅ + T₄₆₆ + ... + T₆₀₀.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 19422798 and 19422807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19422847) 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, 2721 + ... + 6800.

Almost surely, 2^19422840 is an apocalyptic number.

19422840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19422840 is an abundant number, since it is smaller than the sum of its proper divisors (42279720).

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

19422840 is a wasteful number, since it uses less digits than its factorization.

19422840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9552 (or 9548 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 19422840 is about 4407.1351238645. The cubic root of 19422840 is about 268.8051453451.

The spelling of 19422840 in words is "nineteen million, four hundred twenty-two thousand, eight hundred forty".