385631987 has 4 divisors (see below), whose sum is σ = 415296000. Its totient is φ = 355967976.

The previous prime is 385631969. The next prime is 385631993. The reversal of 385631987 is 789136583.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789136583 = 17 ⋅46419799.

It is not a de Polignac number, because 385631987 - 2²⁰ = 384583411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385631947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14831987 + ... + 14832012.

It is an arithmetic number, because the mean of its divisors is an integer number (103824000).

Almost surely, 2^385631987 is an apocalyptic number.

385631987 is a deficient number, since it is larger than the sum of its proper divisors (29664013).

385631987 is a wasteful number, since it uses less digits than its factorization.

385631987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29664012.

The product of its digits is 1088640, while the sum is 50.

The square root of 385631987 is about 19637.5147867545. The cubic root of 385631987 is about 727.8764753135.

The spelling of 385631987 in words is "three hundred eighty-five million, six hundred thirty-one thousand, nine hundred eighty-seven".