1020231405 has 24 divisors (see below), whose sum is σ = 1797396120. Its totient is φ = 535201920.

The previous prime is 1020231403. The next prime is 1020231419. The reversal of 1020231405 is 5041320201.

1020231405 is a `hidden beast` number, since 10 + 20 + 231 + 405 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1153476 + 1019077929 = 1074^2 + 31923^2 .

It is not a de Polignac number, because 1020231405 - 2¹ = 1020231403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020231403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183090 + ... + 188579.

It is an arithmetic number, because the mean of its divisors is an integer number (74891505).

Almost surely, 2^1020231405 is an apocalyptic number.

1020231405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020231405 is a deficient number, since it is larger than the sum of its proper divisors (777164715).

1020231405 is a wasteful number, since it uses less digits than its factorization.

1020231405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371741 (or 371738 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1020231405 is about 31941.0614256947. The cubic root of 1020231405 is about 1006.6988271794.

Adding to 1020231405 its reverse (5041320201), we get a palindrome (6061551606).

The spelling of 1020231405 in words is "one billion, twenty million, two hundred thirty-one thousand, four hundred five".