195390621 has 12 divisors (see below), whose sum is σ = 285804480. Its totient is φ = 128611080.

The previous prime is 195390607. The next prime is 195390631. The reversal of 195390621 is 126093591.

It is not a de Polignac number, because 195390621 - 2⁶ = 195390557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195390631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136695 + ... + 138116.

It is an arithmetic number, because the mean of its divisors is an integer number (23817040).

Almost surely, 2^195390621 is an apocalyptic number.

It is an amenable number.

195390621 is a deficient number, since it is larger than the sum of its proper divisors (90413859).

195390621 is a wasteful number, since it uses less digits than its factorization.

195390621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274896 (or 274893 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 195390621 is about 13978.2195218132. The cubic root of 195390621 is about 580.2759497434.

The spelling of 195390621 in words is "one hundred ninety-five million, three hundred ninety thousand, six hundred twenty-one".