387216394 has 8 divisors (see below), whose sum is σ = 587350980. Its totient is φ = 191432736.

The previous prime is 387216391. The next prime is 387216407. The reversal of 387216394 is 493612783.

It can be written as a sum of positive squares in 2 ways, for example, as 354004225 + 33212169 = 18815^2 + 5763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 387216394.

It is not an unprimeable number, because it can be changed into a prime (387216391) 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, 1087509 + ... + 1087864.

Almost surely, 2^387216394 is an apocalyptic number.

387216394 is a deficient number, since it is larger than the sum of its proper divisors (200134586).

387216394 is a wasteful number, since it uses less digits than its factorization.

387216394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175464.

The product of its digits is 217728, while the sum is 43.

The square root of 387216394 is about 19677.8147668891. The cubic root of 387216394 is about 728.8719639308.

The spelling of 387216394 in words is "three hundred eighty-seven million, two hundred sixteen thousand, three hundred ninety-four".