1945838213 has 4 divisors (see below), whose sum is σ = 2122732608. Its totient is φ = 1768943820.

The previous prime is 1945838197. The next prime is 1945838227. The reversal of 1945838213 is 3128385491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1945838213 - 2⁴ = 1945838197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945838273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88447181 + ... + 88447202.

It is an arithmetic number, because the mean of its divisors is an integer number (530683152).

Almost surely, 2^1945838213 is an apocalyptic number.

It is an amenable number.

1945838213 is a deficient number, since it is larger than the sum of its proper divisors (176894395).

1945838213 is a wasteful number, since it uses less digits than its factorization.

1945838213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176894394.

The product of its digits is 207360, while the sum is 44.

The square root of 1945838213 is about 44111.6562033211. The cubic root of 1945838213 is about 1248.4435482107.

The spelling of 1945838213 in words is "one billion, nine hundred forty-five million, eight hundred thirty-eight thousand, two hundred thirteen".