387772640 has 48 divisors (see below), whose sum is σ = 955952928. Its totient is φ = 148363776.

The previous prime is 387772639. The next prime is 387772643. The reversal of 387772640 is 46277783.

It is a junction number, because it is equal to n+sod(n) for n = 387772591 and 387772600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387772643) 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, 49007 + ... + 56366.

It is an arithmetic number, because the mean of its divisors is an integer number (19915686).

Almost surely, 2^387772640 is an apocalyptic number.

It is an amenable number.

387772640 is an abundant number, since it is smaller than the sum of its proper divisors (568180288).

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

387772640 is a wasteful number, since it uses less digits than its factorization.

387772640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105411 (or 105403 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 44.

The square root of 387772640 is about 19691.9435302867. The cubic root of 387772640 is about 729.2208111885.

The spelling of 387772640 in words is "three hundred eighty-seven million, seven hundred seventy-two thousand, six hundred forty".