19941390 has 80 divisors (see below), whose sum is σ = 61297632. Its totient is φ = 4556736.

The previous prime is 19941371. The next prime is 19941403. The reversal of 19941390 is 9314991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3912 + ... + 7428.

Almost surely, 2^19941390 is an apocalyptic number.

19941390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19941390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30648816).

19941390 is an abundant number, since it is smaller than the sum of its proper divisors (41356242).

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

19941390 is a wasteful number, since it uses less digits than its factorization.

19941390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3543 (or 3534 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 19941390 is about 4465.5783500013. The cubic root of 19941390 is about 271.1763488655.

The spelling of 19941390 in words is "nineteen million, nine hundred forty-one thousand, three hundred ninety".