1950381921 has 16 divisors (see below), whose sum is σ = 2714002560. Its totient is φ = 1244302080.

The previous prime is 1950381913. The next prime is 1950381973. The reversal of 1950381921 is 1291830591.

It is not a de Polignac number, because 1950381921 - 2³ = 1950381913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1950381921.

It is not an unprimeable number, because it can be changed into a prime (1950381221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89365 + ... + 109026.

It is an arithmetic number, because the mean of its divisors is an integer number (169625160).

Almost surely, 2^1950381921 is an apocalyptic number.

It is an amenable number.

1950381921 is a deficient number, since it is larger than the sum of its proper divisors (763620639).

1950381921 is a wasteful number, since it uses less digits than its factorization.

1950381921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198536.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 1950381921 is about 44163.1285236904. The cubic root of 1950381921 is about 1249.4145356413.

The spelling of 1950381921 in words is "one billion, nine hundred fifty million, three hundred eighty-one thousand, nine hundred twenty-one".