1213040144 has 20 divisors (see below), whose sum is σ = 2388796140. Its totient is φ = 596576640.

The previous prime is 1213040131. The next prime is 1213040201. The reversal of 1213040144 is 4410403121.

It can be written as a sum of positive squares in 2 ways, for example, as 377136400 + 835903744 = 19420^2 + 28912^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620459 + ... + 622410.

It is an arithmetic number, because the mean of its divisors is an integer number (119439807).

Almost surely, 2^1213040144 is an apocalyptic number.

It is an amenable number.

1213040144 is a deficient number, since it is larger than the sum of its proper divisors (1175755996).

1213040144 is a wasteful number, since it uses less digits than its factorization.

1213040144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242938 (or 1242932 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1213040144 is about 34828.7258451985. The cubic root of 1213040144 is about 1066.4939378296.

Adding to 1213040144 its reverse (4410403121), we get a palindrome (5623443265).

The spelling of 1213040144 in words is "one billion, two hundred thirteen million, forty thousand, one hundred forty-four".