1022123540 has 12 divisors (see below), whose sum is σ = 2146459476. Its totient is φ = 408849408.

The previous prime is 1022123539. The next prime is 1022123549. The reversal of 1022123540 is 453212201.

It can be written as a sum of positive squares in 2 ways, for example, as 241926916 + 780196624 = 15554^2 + 27932^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 51106177 = 1022123540 / (1 + 0 + 2 + 2 + 1 + 2 + 3 + 5 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022123549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25553069 + ... + 25553108.

It is an arithmetic number, because the mean of its divisors is an integer number (178871623).

Almost surely, 2^1022123540 is an apocalyptic number.

1022123540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1022123540 is an abundant number, since it is smaller than the sum of its proper divisors (1124335936).

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

1022123540 is a wasteful number, since it uses less digits than its factorization.

1022123540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51106186 (or 51106184 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1022123540 is about 31970.6668682403. Note that the first 3 decimals coincide. The cubic root of 1022123540 is about 1007.3207886042.

Adding to 1022123540 its reverse (453212201), we get a palindrome (1475335741).

The spelling of 1022123540 in words is "one billion, twenty-two million, one hundred twenty-three thousand, five hundred forty".