1028021404 has 12 divisors (see below), whose sum is σ = 1802203200. Its totient is φ = 513106208.

The previous prime is 1028021389. The next prime is 1028021419. The reversal of 1028021404 is 4041208201.

It is an interprime number because it is at equal distance from previous prime (1028021389) and next prime (1028021419).

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, 223564 + ... + 228115.

It is an arithmetic number, because the mean of its divisors is an integer number (150183600).

Almost surely, 2^1028021404 is an apocalyptic number.

It is an amenable number.

1028021404 is a deficient number, since it is larger than the sum of its proper divisors (774181796).

1028021404 is a wasteful number, since it uses less digits than its factorization.

1028021404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452252 (or 452250 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 1028021404 is about 32062.7728682346. The cubic root of 1028021404 is about 1009.2545569675.

Adding to 1028021404 its reverse (4041208201), we get a palindrome (5069229605).

It can be divided in two parts, 10280 and 21404, that added together give a square (31684 = 178²).

The spelling of 1028021404 in words is "one billion, twenty-eight million, twenty-one thousand, four hundred four".