1894505421 has 4 divisors (see below), whose sum is σ = 2526007232. Its totient is φ = 1263003612.

The previous prime is 1894505411. The next prime is 1894505443. The reversal of 1894505421 is 1245054981.

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 not a de Polignac number, because 1894505421 - 2¹³ = 1894497229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1894505421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1894505411) 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, 315750901 + ... + 315750906.

It is an arithmetic number, because the mean of its divisors is an integer number (631501808).

Almost surely, 2^1894505421 is an apocalyptic number.

It is an amenable number.

1894505421 is a deficient number, since it is larger than the sum of its proper divisors (631501811).

1894505421 is an equidigital number, since it uses as much as digits as its factorization.

1894505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631501810.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 1894505421 is about 43525.9166589286. The cubic root of 1894505421 is about 1237.3672508148.

The spelling of 1894505421 in words is "one billion, eight hundred ninety-four million, five hundred five thousand, four hundred twenty-one".