1861263372 has 24 divisors (see below), whose sum is σ = 4344480000. Its totient is φ = 620202256.

The previous prime is 1861263337. The next prime is 1861263373. The reversal of 1861263372 is 2733621681.

It is a self number, because there is not a number n which added to its sum of digits gives 1861263372.

It is not an unprimeable number, because it can be changed into a prime (1861263373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10129 + ... + 61847.

It is an arithmetic number, because the mean of its divisors is an integer number (181020000).

Almost surely, 2^1861263372 is an apocalyptic number.

1861263372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1861263372 is an abundant number, since it is smaller than the sum of its proper divisors (2483216628).

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

1861263372 is a wasteful number, since it uses less digits than its factorization.

1861263372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54725 (or 54723 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 1861263372 is about 43142.3616877890. The cubic root of 1861263372 is about 1230.0873254149.

The spelling of 1861263372 in words is "one billion, eight hundred sixty-one million, two hundred sixty-three thousand, three hundred seventy-two".