1244506638 has 16 divisors (see below), whose sum is σ = 2574841680. Its totient is φ = 400530816.

The previous prime is 1244506603. The next prime is 1244506639. The reversal of 1244506638 is 8366054421.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1244506596 and 1244506605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244506639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575995 + ... + 3576342.

It is an arithmetic number, because the mean of its divisors is an integer number (160927605).

Almost surely, 2^1244506638 is an apocalyptic number.

1244506638 is an abundant number, since it is smaller than the sum of its proper divisors (1330335042).

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

1244506638 is a wasteful number, since it uses less digits than its factorization.

1244506638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152371.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 1244506638 is about 35277.5656473062. The cubic root of 1244506638 is about 1075.6370157769.

The spelling of 1244506638 in words is "one billion, two hundred forty-four million, five hundred six thousand, six hundred thirty-eight".