1820892381 has 24 divisors (see below), whose sum is σ = 3080993184. Its totient is φ = 945917280.

The previous prime is 1820892361. The next prime is 1820892383. The reversal of 1820892381 is 1832980281.

1820892381 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1820892381 - 2⁶ = 1820892317 is a prime.

It is a super-2 number, since 2×1820892381² = 6631298126367698322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820892383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 561430 + ... + 564663.

It is an arithmetic number, because the mean of its divisors is an integer number (128374716).

Almost surely, 2^1820892381 is an apocalyptic number.

1820892381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1820892381 is a deficient number, since it is larger than the sum of its proper divisors (1260100803).

1820892381 is a wasteful number, since it uses less digits than its factorization.

1820892381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126121 (or 1126114 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 1820892381 is about 42671.9156003102. The cubic root of 1820892381 is about 1221.1286654887.

The spelling of 1820892381 in words is "one billion, eight hundred twenty million, eight hundred ninety-two thousand, three hundred eighty-one".