1538120478 has 16 divisors (see below), whose sum is σ = 3085059600. Its totient is φ = 511237056.

The previous prime is 1538120477. The next prime is 1538120489. The reversal of 1538120478 is 8740218351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538120477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365175 + ... + 369362.

It is an arithmetic number, because the mean of its divisors is an integer number (192816225).

Almost surely, 2^1538120478 is an apocalyptic number.

1538120478 is an abundant number, since it is smaller than the sum of its proper divisors (1546939122).

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

1538120478 is a wasteful number, since it uses less digits than its factorization.

1538120478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734891.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 1538120478 is about 39218.8791017795. The cubic root of 1538120478 is about 1154.3303597588.

The spelling of 1538120478 in words is "one billion, five hundred thirty-eight million, one hundred twenty thousand, four hundred seventy-eight".