1540258138438 has 8 divisors (see below), whose sum is σ = 2359544382432. Its totient is φ = 753743344296.

The previous prime is 1540258138423. The next prime is 1540258138439. The reversal of 1540258138438 is 8348318520451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540258138439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8192862345 + ... + 8192862532.

It is an arithmetic number, because the mean of its divisors is an integer number (294943047804).

Almost surely, 2^{1540258138438} is an apocalyptic number.

1540258138438 is a deficient number, since it is larger than the sum of its proper divisors (819286243994).

1540258138438 is a wasteful number, since it uses less digits than its factorization.

1540258138438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16385724926.

The product of its (nonzero) digits is 3686400, while the sum is 52.

The spelling of 1540258138438 in words is "one trillion, five hundred forty billion, two hundred fifty-eight million, one hundred thirty-eight thousand, four hundred thirty-eight".