1851342390400 has 96 divisors (see below), whose sum is σ = 4574506158180. Its totient is φ = 740356915200.

The previous prime is 1851342390383. The next prime is 1851342390487. The reversal of 1851342390400 is 40932431581.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1740943024704 + 110399365696 = 1319448^2 + 332264^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13502992 + ... + 13639408.

Almost surely, 2^{1851342390400} is an apocalyptic number.

1851342390400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851342390400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2287253079090).

1851342390400 is an abundant number, since it is smaller than the sum of its proper divisors (2723163767780).

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

1851342390400 is a wasteful number, since it uses less digits than its factorization.

1851342390400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140682 (or 140665 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 1851342390400 in words is "one trillion, eight hundred fifty-one billion, three hundred forty-two million, three hundred ninety thousand, four hundred".