1864861344 has 72 divisors (see below), whose sum is σ = 5533792992. Its totient is φ = 594591360.

The previous prime is 1864861337. The next prime is 1864861351. The reversal of 1864861344 is 4431684681.

It is an interprime number because it is at equal distance from previous prime (1864861337) and next prime (1864861351).

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1864861344.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134142 + ... + 147389.

It is an arithmetic number, because the mean of its divisors is an integer number (76858236).

Almost surely, 2^1864861344 is an apocalyptic number.

It is an amenable number.

1864861344 is an abundant number, since it is smaller than the sum of its proper divisors (3668931648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1864861344 is a wasteful number, since it uses less digits than its factorization.

1864861344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281570 (or 281559 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 1864861344 is about 43184.0403853090. The cubic root of 1864861344 is about 1230.8794345198.

The spelling of 1864861344 in words is "one billion, eight hundred sixty-four million, eight hundred sixty-one thousand, three hundred forty-four".