19426440 has 64 divisors (see below), whose sum is σ = 63581760. Its totient is φ = 4709120.

The previous prime is 19426439. The next prime is 19426447. The reversal of 19426440 is 4462491.

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 = 19426398 and 19426407.

It is not an unprimeable number, because it can be changed into a prime (19426447) 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, 6039 + ... + 8678.

It is an arithmetic number, because the mean of its divisors is an integer number (993465).

Almost surely, 2^19426440 is an apocalyptic number.

19426440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19426440 is an abundant number, since it is smaller than the sum of its proper divisors (44155320).

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

19426440 is a wasteful number, since it uses less digits than its factorization.

19426440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14742 (or 14738 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 19426440 is about 4407.5435335343. The cubic root of 19426440 is about 268.8217518891.

The spelling of 19426440 in words is "nineteen million, four hundred twenty-six thousand, four hundred forty".