1540721842 has 16 divisors (see below), whose sum is σ = 2529247392. Its totient is φ = 698087520.

The previous prime is 1540721839. The next prime is 1540721843. The reversal of 1540721842 is 2481270451.

It is a junction number, because it is equal to n+sod(n) for n = 1540721798 and 1540721807.

It is not an unprimeable number, because it can be changed into a prime (1540721843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104988 + ... + 118759.

It is an arithmetic number, because the mean of its divisors is an integer number (158077962).

Almost surely, 2^1540721842 is an apocalyptic number.

1540721842 is a deficient number, since it is larger than the sum of its proper divisors (988525550).

1540721842 is a wasteful number, since it uses less digits than its factorization.

1540721842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224073.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 1540721842 is about 39252.0297819106. The cubic root of 1540721842 is about 1154.9807514143.

It can be divided in two parts, 15407 and 21842, that added together give a square (37249 = 193²).

The spelling of 1540721842 in words is "one billion, five hundred forty million, seven hundred twenty-one thousand, eight hundred forty-two".