19941428 has 12 divisors (see below), whose sum is σ = 37582020. Its totient is φ = 9203712.

The previous prime is 19941419. The next prime is 19941433. The reversal of 19941428 is 82414991.

It can be written as a sum of positive squares in 2 ways, for example, as 6822544 + 13118884 = 2612^2 + 3622^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19941391 and 19941400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191693 + ... + 191796.

It is an arithmetic number, because the mean of its divisors is an integer number (3131835).

Almost surely, 2^19941428 is an apocalyptic number.

It is an amenable number.

19941428 is a deficient number, since it is larger than the sum of its proper divisors (17640592).

19941428 is a wasteful number, since it uses less digits than its factorization.

19941428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383506 (or 383504 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 19941428 is about 4465.5826047673. The cubic root of 19941428 is about 271.1765211152.

The spelling of 19941428 in words is "nineteen million, nine hundred forty-one thousand, four hundred twenty-eight".