1851193940 has 48 divisors (see below), whose sum is σ = 4095840000. Its totient is φ = 700866432.

The previous prime is 1851193919. The next prime is 1851193943. The reversal of 1851193940 is 493911581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851193943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758402 + ... + 760838.

It is an arithmetic number, because the mean of its divisors is an integer number (85330000).

Almost surely, 2^1851193940 is an apocalyptic number.

1851193940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1851193940 is an abundant number, since it is smaller than the sum of its proper divisors (2244646060).

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

1851193940 is a wasteful number, since it uses less digits than its factorization.

1851193940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464 (or 4462 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1851193940 is about 43025.5033671891. The cubic root of 1851193940 is about 1227.8650562423.

The spelling of 1851193940 in words is "one billion, eight hundred fifty-one million, one hundred ninety-three thousand, nine hundred forty".