1538922890 has 16 divisors (see below), whose sum is σ = 2773324008. Its totient is φ = 614844096.

The previous prime is 1538922887. The next prime is 1538922911. The reversal of 1538922890 is 982298351.

It can be written as a sum of positive squares in 4 ways, for example, as 377408329 + 1161514561 = 19427^2 + 34081^2 .

It is a super-2 number, since 2×1538922890² = 4736567322731904200, which contains 22 as substring.

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, 81677 + ... + 98736.

Almost surely, 2^1538922890 is an apocalyptic number.

1538922890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1538922890 is a deficient number, since it is larger than the sum of its proper divisors (1234401118).

1538922890 is a wasteful number, since it uses less digits than its factorization.

1538922890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181273.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 1538922890 is about 39229.1076880421. The cubic root of 1538922890 is about 1154.5310565449.

The spelling of 1538922890 in words is "one billion, five hundred thirty-eight million, nine hundred twenty-two thousand, eight hundred ninety".