1864004821 has 8 divisors (see below), whose sum is σ = 2135503040. Its totient is φ = 1593809568.

The previous prime is 1864004803. The next prime is 1864004827. The reversal of 1864004821 is 1284004681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1864004821 - 2⁷ = 1864004693 is a prime.

It is a super-2 number, since 2×1864004821² = 6949027945422484082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864004827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322671 + ... + 328396.

It is an arithmetic number, because the mean of its divisors is an integer number (266937880).

Almost surely, 2^1864004821 is an apocalyptic number.

It is an amenable number.

1864004821 is a deficient number, since it is larger than the sum of its proper divisors (271498219).

1864004821 is an equidigital number, since it uses as much as digits as its factorization.

1864004821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651483.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 1864004821 is about 43174.1221219378. The cubic root of 1864004821 is about 1230.6909597397.

The spelling of 1864004821 in words is "one billion, eight hundred sixty-four million, four thousand, eight hundred twenty-one".