803991428 has 6 divisors (see below), whose sum is σ = 1406985006. Its totient is φ = 401995712.

The previous prime is 803991371. The next prime is 803991439. The reversal of 803991428 is 824199308.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 593799424 + 210192004 = 24368^2 + 14498^2 .

It is a super-3 number, since 3×803991428³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100498925 + ... + 100498932.

It is an arithmetic number, because the mean of its divisors is an integer number (234497501).

Almost surely, 2^803991428 is an apocalyptic number.

It is an amenable number.

803991428 is a deficient number, since it is larger than the sum of its proper divisors (602993578).

803991428 is a wasteful number, since it uses less digits than its factorization.

803991428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200997861 (or 200997859 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 803991428 is about 28354.7426015473. The cubic root of 803991428 is about 929.8590868320.

The spelling of 803991428 in words is "eight hundred three million, nine hundred ninety-one thousand, four hundred twenty-eight".