1900338728 has 8 divisors (see below), whose sum is σ = 3563135130. Its totient is φ = 950169360.

The previous prime is 1900338721. The next prime is 1900338731. The reversal of 1900338728 is 8278330091.

It can be written as a sum of positive squares in only one way, i.e., 1772241604 + 128097124 = 42098^2 + 11318^2 .

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

It is a super-2 number, since 2×1900338728² = 7222574562273315968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900338721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118771163 + ... + 118771178.

Almost surely, 2^1900338728 is an apocalyptic number.

It is an amenable number.

1900338728 is a deficient number, since it is larger than the sum of its proper divisors (1662796402).

1900338728 is a wasteful number, since it uses less digits than its factorization.

1900338728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237542347 (or 237542343 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1900338728 is about 43592.8747388836. The cubic root of 1900338728 is about 1238.6359280182.

The spelling of 1900338728 in words is "one billion, nine hundred million, three hundred thirty-eight thousand, seven hundred twenty-eight".