1864724940 has 144 divisors (see below), whose sum is σ = 6301713600. Its totient is φ = 443165184.

The previous prime is 1864724903. The next prime is 1864724941. The reversal of 1864724940 is 494274681.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1864724941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54121 + ... + 81599.

It is an arithmetic number, because the mean of its divisors is an integer number (43761900).

Almost surely, 2^1864724940 is an apocalyptic number.

1864724940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1864724940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3150856800).

1864724940 is an abundant number, since it is smaller than the sum of its proper divisors (4436988660).

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

1864724940 is a wasteful number, since it uses less digits than its factorization.

1864724940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27536 (or 27531 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 1864724940 is about 43182.4610229663. The cubic root of 1864724940 is about 1230.8494231783.

The spelling of 1864724940 in words is "one billion, eight hundred sixty-four million, seven hundred twenty-four thousand, nine hundred forty".