1856649084 has 96 divisors (see below), whose sum is σ = 4799886336. Its totient is φ = 556062720.

The previous prime is 1856649061. The next prime is 1856649089. The reversal of 1856649084 is 4809466581.

It is a super-2 number, since 2×1856649084² = 6894291642236078112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856649089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390747 + ... + 395469.

It is an arithmetic number, because the mean of its divisors is an integer number (49998816).

Almost surely, 2^1856649084 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1856649084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2399943168).

1856649084 is an abundant number, since it is smaller than the sum of its proper divisors (2943237252).

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

1856649084 is a wasteful number, since it uses less digits than its factorization.

1856649084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835 (or 4833 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The square root of 1856649084 is about 43088.8510406114. The cubic root of 1856649084 is about 1229.0699744747.

The spelling of 1856649084 in words is "one billion, eight hundred fifty-six million, six hundred forty-nine thousand, eighty-four".