1312021040 has 40 divisors (see below), whose sum is σ = 3327764688. Its totient is φ = 477098240.

The previous prime is 1312021037. The next prime is 1312021049. The reversal of 1312021040 is 401202131.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1312021049) 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, 744587 + ... + 746346.

Almost surely, 2^1312021040 is an apocalyptic number.

1312021040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312021040 is an abundant number, since it is smaller than the sum of its proper divisors (2015743648).

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

1312021040 is a wasteful number, since it uses less digits than its factorization.

1312021040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490957 (or 1490951 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1312021040 is about 36221.8309862989. The cubic root of 1312021040 is about 1094.7465868962.

Adding to 1312021040 its reverse (401202131), we get a palindrome (1713223171).

The spelling of 1312021040 in words is "one billion, three hundred twelve million, twenty-one thousand, forty".