1861403694 has 32 divisors (see below), whose sum is σ = 3839447040. Its totient is φ = 601255872.

The previous prime is 1861403693. The next prime is 1861403699. The reversal of 1861403694 is 4963041681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861403693) 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 15 ways as a sum of consecutive naturals, for example, 4362 + ... + 61170.

It is an arithmetic number, because the mean of its divisors is an integer number (119982720).

Almost surely, 2^1861403694 is an apocalyptic number.

1861403694 is an abundant number, since it is smaller than the sum of its proper divisors (1978043346).

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

1861403694 is a wasteful number, since it uses less digits than its factorization.

1861403694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56984.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1861403694 is about 43143.9879241593. The cubic root of 1861403694 is about 1230.1182370309.

The spelling of 1861403694 in words is "one billion, eight hundred sixty-one million, four hundred three thousand, six hundred ninety-four".