1401317520 has 160 divisors (see below), whose sum is σ = 4423324032. Its totient is φ = 366944256.

The previous prime is 1401317503. The next prime is 1401317537. The reversal of 1401317520 is 257131041.

It is an interprime number because it is at equal distance from previous prime (1401317503) and next prime (1401317537).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4420402 + ... + 4420718.

Almost surely, 2^1401317520 is an apocalyptic number.

1401317520 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 1401317520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2211662016).

1401317520 is an abundant number, since it is smaller than the sum of its proper divisors (3022006512).

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

1401317520 is a wasteful number, since it uses less digits than its factorization.

1401317520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1401317520 is about 37434.1758290469. The cubic root of 1401317520 is about 1119.0397594487.

Adding to 1401317520 its reverse (257131041), we get a palindrome (1658448561).

The spelling of 1401317520 in words is "one billion, four hundred one million, three hundred seventeen thousand, five hundred twenty".