1861040745 has 64 divisors (see below), whose sum is σ = 3655549440. Its totient is φ = 893528064.

The previous prime is 1861040729. The next prime is 1861040749. The reversal of 1861040745 is 5470401681.

It is a happy number.

It is not a de Polignac number, because 1861040745 - 2⁴ = 1861040729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1861040749) 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 63 ways as a sum of consecutive naturals, for example, 35157 + ... + 70413.

It is an arithmetic number, because the mean of its divisors is an integer number (57117960).

Almost surely, 2^1861040745 is an apocalyptic number.

1861040745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1861040745 is a deficient number, since it is larger than the sum of its proper divisors (1794508695).

1861040745 is a wasteful number, since it uses less digits than its factorization.

1861040745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35311 (or 35305 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1861040745 is about 43139.7814667622. The cubic root of 1861040745 is about 1230.0382795939.

The spelling of 1861040745 in words is "one billion, eight hundred sixty-one million, forty thousand, seven hundred forty-five".