1851397680 has 320 divisors, whose sum is σ = 6561865728. Its totient is φ = 427822080.

The previous prime is 1851397661. The next prime is 1851397703. The reversal of 1851397680 is 867931581.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5335267 + ... + 5335613.

Almost surely, 2^1851397680 is an apocalyptic number.

1851397680 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 1851397680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3280932864).

1851397680 is an abundant number, since it is smaller than the sum of its proper divisors (4710468048).

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

1851397680 is a wasteful number, since it uses less digits than its factorization.

1851397680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1851397680 is about 43027.8709675485. The cubic root of 1851397680 is about 1227.9101003341.

The spelling of 1851397680 in words is "one billion, eight hundred fifty-one million, three hundred ninety-seven thousand, six hundred eighty".