1240021044 has 18 divisors (see below), whose sum is σ = 3134497730. Its totient is φ = 413340336.

The previous prime is 1240021043. The next prime is 1240021093. The reversal of 1240021044 is 4401200421.

1240021044 is a `hidden beast` number, since 12 + 400 + 210 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1077152400 + 162868644 = 32820^2 + 12762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240021043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17222479 + ... + 17222550.

Almost surely, 2^1240021044 is an apocalyptic number.

It is an amenable number.

1240021044 is an abundant number, since it is smaller than the sum of its proper divisors (1894476686).

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

1240021044 is a wasteful number, since it uses less digits than its factorization.

1240021044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34445039 (or 34445034 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1240021044 is about 35213.9325267713. The cubic root of 1240021044 is about 1074.3431484678.

Adding to 1240021044 its reverse (4401200421), we get a palindrome (5641221465).

The spelling of 1240021044 in words is "one billion, two hundred forty million, twenty-one thousand, forty-four".