1894782021 has 32 divisors (see below), whose sum is σ = 2881032192. Its totient is φ = 1096455360.

The previous prime is 1894782007. The next prime is 1894782023. The reversal of 1894782021 is 1202874981.

It is not a de Polignac number, because 1894782021 - 2¹¹ = 1894779973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1894782023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 493716 + ... + 497538.

It is an arithmetic number, because the mean of its divisors is an integer number (90032256).

Almost surely, 2^1894782021 is an apocalyptic number.

1894782021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1894782021 is a deficient number, since it is larger than the sum of its proper divisors (986250171).

1894782021 is a wasteful number, since it uses less digits than its factorization.

1894782021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1894782021 is about 43529.0939602469. The cubic root of 1894782021 is about 1237.4274669047.

The spelling of 1894782021 in words is "one billion, eight hundred ninety-four million, seven hundred eighty-two thousand, twenty-one".