387780140 has 24 divisors (see below), whose sum is σ = 888369552. Its totient is φ = 141010880.

The previous prime is 387780137. The next prime is 387780143. The reversal of 387780140 is 41087783.

It is an interprime number because it is at equal distance from previous prime (387780137) and next prime (387780143).

It is a junction number, because it is equal to n+sod(n) for n = 387780094 and 387780103.

It is not an unprimeable number, because it can be changed into a prime (387780143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881099 + ... + 881538.

It is an arithmetic number, because the mean of its divisors is an integer number (37015398).

Almost surely, 2^387780140 is an apocalyptic number.

It is an amenable number.

387780140 is an abundant number, since it is smaller than the sum of its proper divisors (500589412).

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

387780140 is a wasteful number, since it uses less digits than its factorization.

387780140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762657 (or 1762655 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 387780140 is about 19692.1339625750. The cubic root of 387780140 is about 729.2255125007.

The spelling of 387780140 in words is "three hundred eighty-seven million, seven hundred eighty thousand, one hundred forty".