1540438939 has 16 divisors (see below), whose sum is σ = 1682426592. Its totient is φ = 1401942528.

The previous prime is 1540438931. The next prime is 1540438943. The reversal of 1540438939 is 9398340451.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1540438939 - 2³ = 1540438931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540438931) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 286732 + ... + 292054.

It is an arithmetic number, because the mean of its divisors is an integer number (105151662).

Almost surely, 2^1540438939 is an apocalyptic number.

1540438939 is a deficient number, since it is larger than the sum of its proper divisors (141987653).

1540438939 is a wasteful number, since it uses less digits than its factorization.

1540438939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5646.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 1540438939 is about 39248.4259429598. The cubic root of 1540438939 is about 1154.9100556509.

The spelling of 1540438939 in words is "one billion, five hundred forty million, four hundred thirty-eight thousand, nine hundred thirty-nine".