1509555642 has 48 divisors (see below), whose sum is σ = 3664740672. Its totient is φ = 412547520.

The previous prime is 1509555623. The next prime is 1509555659. The reversal of 1509555642 is 2465559051.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1509555594 and 1509555603.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104859 + ... + 118382.

It is an arithmetic number, because the mean of its divisors is an integer number (76348764).

Almost surely, 2^1509555642 is an apocalyptic number.

1509555642 is an abundant number, since it is smaller than the sum of its proper divisors (2155185030).

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

1509555642 is a wasteful number, since it uses less digits than its factorization.

1509555642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223283 (or 223276 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The square root of 1509555642 is about 38853.0004246776. Note that the first 3 decimals coincide. The cubic root of 1509555642 is about 1147.1398722763.

The spelling of 1509555642 in words is "one billion, five hundred nine million, five hundred fifty-five thousand, six hundred forty-two".