38195921 has 4 divisors (see below), whose sum is σ = 38534052. Its totient is φ = 37857792.

The previous prime is 38195891. The next prime is 38195933. The reversal of 38195921 is 12959183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16443025 + 21752896 = 4055^2 + 4664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38195921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38195021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168896 + ... + 169121.

It is an arithmetic number, because the mean of its divisors is an integer number (9633513).

Almost surely, 2^38195921 is an apocalyptic number.

It is an amenable number.

38195921 is a deficient number, since it is larger than the sum of its proper divisors (338131).

38195921 is a wasteful number, since it uses less digits than its factorization.

38195921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338130.

The product of its digits is 19440, while the sum is 38.

The square root of 38195921 is about 6180.2848639848. The cubic root of 38195921 is about 336.7743413829.

The spelling of 38195921 in words is "thirty-eight million, one hundred ninety-five thousand, nine hundred twenty-one".