1021423836 has 72 divisors (see below), whose sum is σ = 2570424192. Its totient is φ = 315084000.

The previous prime is 1021423723. The next prime is 1021423853. The reversal of 1021423836 is 6383241201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263311 + ... + 267161.

It is an arithmetic number, because the mean of its divisors is an integer number (35700336).

Almost surely, 2^1021423836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021423836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285212096).

1021423836 is an abundant number, since it is smaller than the sum of its proper divisors (1549000356).

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

1021423836 is a wasteful number, since it uses less digits than its factorization.

1021423836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943 (or 3910 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1021423836 is about 31959.7220889043. The cubic root of 1021423836 is about 1007.0908792536.

The spelling of 1021423836 in words is "one billion, twenty-one million, four hundred twenty-three thousand, eight hundred thirty-six".