19951428 has 36 divisors (see below), whose sum is σ = 54155472. Its totient is φ = 5700240.

The previous prime is 19951427. The next prime is 19951433. The reversal of 19951428 is 82415991.

It is not an unprimeable number, because it can be changed into a prime (19951423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16378 + ... + 17553.

Almost surely, 2^19951428 is an apocalyptic number.

It is an amenable number.

19951428 is an abundant number, since it is smaller than the sum of its proper divisors (34204044).

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

19951428 is a wasteful number, since it uses less digits than its factorization.

19951428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33952 (or 33943 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 19951428 is about 4466.7021391626. The cubic root of 19951428 is about 271.2218423772.

The spelling of 19951428 in words is "nineteen million, nine hundred fifty-one thousand, four hundred twenty-eight".