1854421969 has 3 divisors (see below), whose sum is σ = 1854465033. Its totient is φ = 1854378906.

The previous prime is 1854421967. The next prime is 1854421997. The reversal of 1854421969 is 9691244581.

The square root of 1854421969 is 43063.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1854421969 - 2¹ = 1854421967 is a prime.

It is a super-2 number, since 2×1854421969² = 6877761678219673922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1854421963) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 21532 + ... + 64594.

It is an arithmetic number, because the mean of its divisors is an integer number (618155011).

Almost surely, 2^1854421969 is an apocalyptic number.

1854421969 is the 43063-rd square number.

1854421969 is the 21532-nd centered octagonal number.

It is an amenable number.

1854421969 is a deficient number, since it is larger than the sum of its proper divisors (43064).

1854421969 is an frugal number, since it uses more digits than its factorization.

1854421969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86126 (or 43063 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The cubic root of 1854421969 is about 1228.5783404843.

Multiplying 1854421969 by its sum of digits (49), we get a square (90866676481 = 301441²).

The spelling of 1854421969 in words is "one billion, eight hundred fifty-four million, four hundred twenty-one thousand, nine hundred sixty-nine".