1315623540 has 288 divisors, whose sum is σ = 4951787904. Its totient is φ = 257187840.

The previous prime is 1315623521. The next prime is 1315623553. The reversal of 1315623540 is 453265131.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1315623498 and 1315623507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 548584 + ... + 550976.

It is an arithmetic number, because the mean of its divisors is an integer number (17193708).

Almost surely, 2^1315623540 is an apocalyptic number.

1315623540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1315623540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2475893952).

1315623540 is an abundant number, since it is smaller than the sum of its proper divisors (3636164364).

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

1315623540 is a wasteful number, since it uses less digits than its factorization.

1315623540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1315623540 is about 36271.5251953926. The cubic root of 1315623540 is about 1095.7476431169.

Adding to 1315623540 its reverse (453265131), we get a palindrome (1768888671).

The spelling of 1315623540 in words is "one billion, three hundred fifteen million, six hundred twenty-three thousand, five hundred forty".