1538956890 has 24 divisors (see below), whose sum is σ = 4001288148. Its totient is φ = 410388480.

The previous prime is 1538956883. The next prime is 1538956907. The reversal of 1538956890 is 986598351.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1393006329 + 145950561 = 37323^2 + 12081^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8549671 + ... + 8549850.

Almost surely, 2^1538956890 is an apocalyptic number.

1538956890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1538956890 is an abundant number, since it is smaller than the sum of its proper divisors (2462331258).

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

1538956890 is a wasteful number, since it uses less digits than its factorization.

1538956890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17099534 (or 17099531 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The square root of 1538956890 is about 39229.5410373356. The cubic root of 1538956890 is about 1154.5395589780.

The spelling of 1538956890 in words is "one billion, five hundred thirty-eight million, nine hundred fifty-six thousand, eight hundred ninety".