387774431 has 4 divisors (see below), whose sum is σ = 423026664. Its totient is φ = 352522200.

The previous prime is 387774421. The next prime is 387774469. The reversal of 387774431 is 134477783.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387774431 is a prime.

It is a super-2 number, since 2×387774431² = 300738018674747522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387774421) 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, 17626100 + ... + 17626121.

It is an arithmetic number, because the mean of its divisors is an integer number (105756666).

Almost surely, 2^387774431 is an apocalyptic number.

387774431 is a deficient number, since it is larger than the sum of its proper divisors (35252233).

387774431 is a wasteful number, since it uses less digits than its factorization.

387774431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35252232.

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

The square root of 387774431 is about 19691.9890056845. The cubic root of 387774431 is about 729.2219338673.

The spelling of 387774431 in words is "three hundred eighty-seven million, seven hundred seventy-four thousand, four hundred thirty-one".