1900423688 has 8 divisors (see below), whose sum is σ = 3563294430. Its totient is φ = 950211840.

The previous prime is 1900423687. The next prime is 1900423739. The reversal of 1900423688 is 8863240091.

It can be written as a sum of positive squares in only one way, i.e., 1237773124 + 662650564 = 35182^2 + 25742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1900423688² = 7223220387823042688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900423687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118776473 + ... + 118776488.

Almost surely, 2^1900423688 is an apocalyptic number.

It is an amenable number.

1900423688 is a deficient number, since it is larger than the sum of its proper divisors (1662870742).

1900423688 is a wasteful number, since it uses less digits than its factorization.

1900423688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237552967 (or 237552963 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1900423688 is about 43593.8491991703. The cubic root of 1900423688 is about 1238.6543866468.

The spelling of 1900423688 in words is "one billion, nine hundred million, four hundred twenty-three thousand, six hundred eighty-eight".