19391472 has 60 divisors (see below), whose sum is σ = 54569424. Its totient is φ = 6428160.

The previous prime is 19391467. The next prime is 19391479. The reversal of 19391472 is 27419391.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19391479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44568 + ... + 45000.

Almost surely, 2^19391472 is an apocalyptic number.

19391472 is a gapful number since it is divisible by the number (12) 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 19391472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27284712).

19391472 is an abundant number, since it is smaller than the sum of its proper divisors (35177952).

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

19391472 is a wasteful number, since it uses less digits than its factorization.

19391472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 749 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 19391472 is about 4403.5749113646. The cubic root of 19391472 is about 268.6603600810.

The spelling of 19391472 in words is "nineteen million, three hundred ninety-one thousand, four hundred seventy-two".