1520521380 has 288 divisors, whose sum is σ = 5450984448. Its totient is φ = 335923200.

The previous prime is 1520521351. The next prime is 1520521397. The reversal of 1520521380 is 831250251.

It is a happy number.

1520521380 is a `hidden beast` number, since 1 + 520 + 5 + 2 + 138 + 0 = 666.

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, 5610645 + ... + 5610915.

Almost surely, 2^1520521380 is an apocalyptic number.

1520521380 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 1520521380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2725492224).

1520521380 is an abundant number, since it is smaller than the sum of its proper divisors (3930463068).

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

1520521380 is a wasteful number, since it uses less digits than its factorization.

1520521380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1520521380 is about 38993.8633633550. The cubic root of 1520521380 is about 1149.9108639167.

It can be divided in two parts, 15205 and 21380, that added together give a triangular number (36585 = T₂₇₀).

The spelling of 1520521380 in words is "one billion, five hundred twenty million, five hundred twenty-one thousand, three hundred eighty".