1371521380 has 12 divisors (see below), whose sum is σ = 2880194940. Its totient is φ = 548608544.

The previous prime is 1371521357. The next prime is 1371521443. The reversal of 1371521380 is 831251731.

It can be written as a sum of positive squares in 2 ways, for example, as 959512576 + 412008804 = 30976^2 + 20298^2 .

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, 34288015 + ... + 34288054.

It is an arithmetic number, because the mean of its divisors is an integer number (240016245).

Almost surely, 2^1371521380 is an apocalyptic number.

1371521380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1371521380 is an abundant number, since it is smaller than the sum of its proper divisors (1508673560).

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

1371521380 is a wasteful number, since it uses less digits than its factorization.

1371521380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68576078 (or 68576076 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1371521380 is about 37034.0570286324. The cubic root of 1371521380 is about 1111.0515101438.

The spelling of 1371521380 in words is "one billion, three hundred seventy-one million, five hundred twenty-one thousand, three hundred eighty".