1861405340 has 12 divisors (see below), whose sum is σ = 3908951256. Its totient is φ = 744562128.

The previous prime is 1861405333. The next prime is 1861405411. The reversal of 1861405340 is 435041681.

It is a junction number, because it is equal to n+sod(n) for n = 1861405297 and 1861405306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46535114 + ... + 46535153.

It is an arithmetic number, because the mean of its divisors is an integer number (325745938).

Almost surely, 2^1861405340 is an apocalyptic number.

1861405340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861405340 is an abundant number, since it is smaller than the sum of its proper divisors (2047545916).

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

1861405340 is a wasteful number, since it uses less digits than its factorization.

1861405340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93070276 (or 93070274 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1861405340 is about 43144.0069998140. The cubic root of 1861405340 is about 1230.1185996200.

The spelling of 1861405340 in words is "one billion, eight hundred sixty-one million, four hundred five thousand, three hundred forty".