1520999970 has 128 divisors (see below), whose sum is σ = 4435292160. Its totient is φ = 326073600.

The previous prime is 1520999969. The next prime is 1520999981. The reversal of 1520999970 is 799990251.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 409120 + ... + 412820.

It is an arithmetic number, because the mean of its divisors is an integer number (34650720).

Almost surely, 2^1520999970 is an apocalyptic number.

1520999970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1520999970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2217646080).

1520999970 is an abundant number, since it is smaller than the sum of its proper divisors (2914292190).

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

1520999970 is a wasteful number, since it uses less digits than its factorization.

1520999970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 459270, while the sum is 51.

The square root of 1520999970 is about 38999.9996153846. Note that the first 3 decimals coincide. The cubic root of 1520999970 is about 1150.0314975620.

The spelling of 1520999970 in words is "one billion, five hundred twenty million, nine hundred ninety-nine thousand, nine hundred seventy".