1315432640 has 28 divisors (see below), whose sum is σ = 3132374736. Its totient is φ = 526172928.

The previous prime is 1315432619. The next prime is 1315432649. The reversal of 1315432640 is 462345131.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1315432649) 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, 2055044 + ... + 2055683.

Almost surely, 2^1315432640 is an apocalyptic number.

1315432640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315432640 is an abundant number, since it is smaller than the sum of its proper divisors (1816942096).

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

1315432640 is an equidigital number, since it uses as much as digits as its factorization.

1315432640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110744 (or 4110734 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1315432640 is about 36268.8935590817. The cubic root of 1315432640 is about 1095.6946420527.

Adding to 1315432640 its reverse (462345131), we get a palindrome (1777777771).

The spelling of 1315432640 in words is "one billion, three hundred fifteen million, four hundred thirty-two thousand, six hundred forty".