1540721742 has 32 divisors (see below), whose sum is σ = 3707001600. Its totient is φ = 417037248.

The previous prime is 1540721737. The next prime is 1540721801. The reversal of 1540721742 is 2471270451.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 964567 + ... + 966162.

It is an arithmetic number, because the mean of its divisors is an integer number (115843800).

Almost surely, 2^1540721742 is an apocalyptic number.

1540721742 is an abundant number, since it is smaller than the sum of its proper divisors (2166279858).

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

1540721742 is a wasteful number, since it uses less digits than its factorization.

1540721742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930760.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 1540721742 is about 39252.0285080911. The cubic root of 1540721742 is about 1154.9807264264.

The spelling of 1540721742 in words is "one billion, five hundred forty million, seven hundred twenty-one thousand, seven hundred forty-two".