1861372480 has 56 divisors (see below), whose sum is σ = 4835347200. Its totient is φ = 676861440.

The previous prime is 1861372477. The next prime is 1861372523. The reversal of 1861372480 is 842731681.

It is a super-3 number, since 3×1861372480³ (a number of 29 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 260880 + ... + 267919.

Almost surely, 2^1861372480 is an apocalyptic number.

1861372480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861372480 is an abundant number, since it is smaller than the sum of its proper divisors (2973974720).

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

1861372480 is a wasteful number, since it uses less digits than its factorization.

1861372480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528827 (or 528817 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1861372480 is about 43143.6261804684. The cubic root of 1861372480 is about 1230.1113610148. Note that the first 3 decimals are identical.

The spelling of 1861372480 in words is "one billion, eight hundred sixty-one million, three hundred seventy-two thousand, four hundred eighty".