1538540738 has 16 divisors (see below), whose sum is σ = 2658269184. Its totient is φ = 654181920.

The previous prime is 1538540701. The next prime is 1538540747. The reversal of 1538540738 is 8370458351.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430883 + ... + 434438.

It is an arithmetic number, because the mean of its divisors is an integer number (166141824).

Almost surely, 2^1538540738 is an apocalyptic number.

1538540738 is a deficient number, since it is larger than the sum of its proper divisors (1119728446).

1538540738 is a wasteful number, since it uses less digits than its factorization.

1538540738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865457.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 1538540738 is about 39224.2366146239. The cubic root of 1538540738 is about 1154.4354825819.

The spelling of 1538540738 in words is "one billion, five hundred thirty-eight million, five hundred forty thousand, seven hundred thirty-eight".