1538690478 has 32 divisors (see below), whose sum is σ = 3458198016. Its totient is φ = 452858208.

The previous prime is 1538690449. The next prime is 1538690479. The reversal of 1538690478 is 8740968351.

It is a self number, because there is not a number n which added to its sum of digits gives 1538690478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538690479) 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, 427050 + ... + 430637.

It is an arithmetic number, because the mean of its divisors is an integer number (108068688).

Almost surely, 2^1538690478 is an apocalyptic number.

1538690478 is an abundant number, since it is smaller than the sum of its proper divisors (1919507538).

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

1538690478 is a wasteful number, since it uses less digits than its factorization.

1538690478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857728.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 1538690478 is about 39226.1453370071. The cubic root of 1538690478 is about 1154.4729335589.

The spelling of 1538690478 in words is "one billion, five hundred thirty-eight million, six hundred ninety thousand, four hundred seventy-eight".