1021408628 has 12 divisors (see below), whose sum is σ = 1788942372. Its totient is φ = 510282240.

The previous prime is 1021408621. The next prime is 1021408651. The reversal of 1021408628 is 8268041201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 333500644 + 687907984 = 18262^2 + 26228^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021408594 and 1021408603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021408621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100043 + ... + 109778.

It is an arithmetic number, because the mean of its divisors is an integer number (149078531).

Almost surely, 2^1021408628 is an apocalyptic number.

It is an amenable number.

1021408628 is a deficient number, since it is larger than the sum of its proper divisors (767533744).

1021408628 is a wasteful number, since it uses less digits than its factorization.

1021408628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211042 (or 211040 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1021408628 is about 31959.4841635468. The cubic root of 1021408628 is about 1007.0858810300.

Adding to 1021408628 its reverse (8268041201), we get a palindrome (9289449829).

The spelling of 1021408628 in words is "one billion, twenty-one million, four hundred eight thousand, six hundred twenty-eight".