19941408 has 72 divisors (see below), whose sum is σ = 60058908. Its totient is φ = 6254592.

The previous prime is 19941407. The next prime is 19941419. The reversal of 19941408 is 80414991.

It can be written as a sum of positive squares in 2 ways, for example, as 19820304 + 121104 = 4452^2 + 348^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is not an unprimeable number, because it can be changed into a prime (19941403) 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, 2860 + ... + 6932.

Almost surely, 2^19941408 is an apocalyptic number.

19941408 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 19941408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30029454).

19941408 is an abundant number, since it is smaller than the sum of its proper divisors (40117500).

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

19941408 is a wasteful number, since it uses less digits than its factorization.

19941408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106 (or 4095 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19941408 is about 4465.5803654172. The cubic root of 19941408 is about 271.1764304575.

It can be divided in two parts, 1 and 9941408, that added together give a square (9941409 = 3153²).

The spelling of 19941408 in words is "nineteen million, nine hundred forty-one thousand, four hundred eight".