1809870428 has 12 divisors (see below), whose sum is σ = 3168146520. Its totient is φ = 904685712.

The previous prime is 1809870401. The next prime is 1809870449. The reversal of 1809870428 is 8240789081.

It is a super-2 number, since 2×1809870428² = 6551261932297806368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45551 + ... + 75462.

It is an arithmetic number, because the mean of its divisors is an integer number (264012210).

Almost surely, 2^1809870428 is an apocalyptic number.

It is an amenable number.

1809870428 is a deficient number, since it is larger than the sum of its proper divisors (1358276092).

1809870428 is a wasteful number, since it uses less digits than its factorization.

1809870428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124756 (or 124754 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 1809870428 is about 42542.5719485788. The cubic root of 1809870428 is about 1218.6598263926.

The spelling of 1809870428 in words is "one billion, eight hundred nine million, eight hundred seventy thousand, four hundred twenty-eight".