1244388487 has 4 divisors (see below), whose sum is σ = 1260140320. Its totient is φ = 1228636656.

The previous prime is 1244388469. The next prime is 1244388511. The reversal of 1244388487 is 7848834421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7848834421 = 199 ⋅39441379.

It is a cyclic number.

It is not a de Polignac number, because 1244388487 - 2¹⁵ = 1244355719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1244388487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244388407) 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, 7875798 + ... + 7875955.

It is an arithmetic number, because the mean of its divisors is an integer number (315035080).

Almost surely, 2^1244388487 is an apocalyptic number.

1244388487 is a deficient number, since it is larger than the sum of its proper divisors (15751833).

1244388487 is an equidigital number, since it uses as much as digits as its factorization.

1244388487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15751832.

The product of its digits is 1376256, while the sum is 49.

The square root of 1244388487 is about 35275.8910163868. The cubic root of 1244388487 is about 1075.6029750824.

The spelling of 1244388487 in words is "one billion, two hundred forty-four million, three hundred eighty-eight thousand, four hundred eighty-seven".