1540021142 has 16 divisors (see below), whose sum is σ = 2521476864. Its totient is φ = 699609000.

The previous prime is 1540021123. The next prime is 1540021151. The reversal of 1540021142 is 2411200451.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21167 + ... + 59397.

It is an arithmetic number, because the mean of its divisors is an integer number (157592304).

Almost surely, 2^1540021142 is an apocalyptic number.

1540021142 is a deficient number, since it is larger than the sum of its proper divisors (981455722).

1540021142 is a wasteful number, since it uses less digits than its factorization.

1540021142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40075.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1540021142 is about 39243.1031137957. The cubic root of 1540021142 is about 1154.8056348537.

Adding to 1540021142 its reverse (2411200451), we get a palindrome (3951221593).

The spelling of 1540021142 in words is "one billion, five hundred forty million, twenty-one thousand, one hundred forty-two".