1543689042 has 24 divisors (see below), whose sum is σ = 3591440496. Its totient is φ = 441053928.

The previous prime is 1543689041. The next prime is 1543689047. The reversal of 1543689042 is 2409863451.

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 = 1543688985 and 1543689003.

It is not an unprimeable number, because it can be changed into a prime (1543689041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2625028 + ... + 2625615.

It is an arithmetic number, because the mean of its divisors is an integer number (149643354).

Almost surely, 2^1543689042 is an apocalyptic number.

1543689042 is an abundant number, since it is smaller than the sum of its proper divisors (2047751454).

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

1543689042 is a wasteful number, since it uses less digits than its factorization.

1543689042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250662 (or 5250655 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 1543689042 is about 39289.8083731647. The cubic root of 1543689042 is about 1155.7217160587.

The spelling of 1543689042 in words is "one billion, five hundred forty-three million, six hundred eighty-nine thousand, forty-two".