19851468 has 120 divisors (see below), whose sum is σ = 59291568. Its totient is φ = 5136768.

The previous prime is 19851463. The next prime is 19851473. The reversal of 19851468 is 86415891.

It is an interprime number because it is at equal distance from previous prime (19851463) and next prime (19851473).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (19851463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 374530 + ... + 374582.

Almost surely, 2^19851468 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19851468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29645784).

19851468 is an abundant number, since it is smaller than the sum of its proper divisors (39440100).

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

19851468 is a wasteful number, since it uses less digits than its factorization.

19851468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 78 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 19851468 is about 4455.4986252944. The cubic root of 19851468 is about 270.7681281659.

The spelling of 19851468 in words is "nineteen million, eight hundred fifty-one thousand, four hundred sixty-eight".