1549509642 has 64 divisors (see below), whose sum is σ = 3763584000. Its totient is φ = 470430720.

The previous prime is 1549509613. The next prime is 1549509721. The reversal of 1549509642 is 2469059451.

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, 1234 + ... + 55682.

It is an arithmetic number, because the mean of its divisors is an integer number (58806000).

Almost surely, 2^1549509642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1549509642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881792000).

1549509642 is an abundant number, since it is smaller than the sum of its proper divisors (2214074358).

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

1549509642 is a wasteful number, since it uses less digits than its factorization.

1549509642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54508 (or 54502 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 1549509642 is about 39363.8113246164. The cubic root of 1549509642 is about 1157.1724738255.

The spelling of 1549509642 in words is "one billion, five hundred forty-nine million, five hundred nine thousand, six hundred forty-two".