387921427 has 4 divisors (see below), whose sum is σ = 404787600. Its totient is φ = 371055256.

The previous prime is 387921407. The next prime is 387921433. The reversal of 387921427 is 724129783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724129783 = 13 ⋅55702291.

It is a cyclic number.

It is not a de Polignac number, because 387921427 - 2²³ = 379532819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387921407) 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, 8433052 + ... + 8433097.

It is an arithmetic number, because the mean of its divisors is an integer number (101196900).

Almost surely, 2^387921427 is an apocalyptic number.

387921427 is a deficient number, since it is larger than the sum of its proper divisors (16866173).

387921427 is a wasteful number, since it uses less digits than its factorization.

387921427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16866172.

The product of its digits is 169344, while the sum is 43.

The square root of 387921427 is about 19695.7210327523. The cubic root of 387921427 is about 729.3140657503.

The spelling of 387921427 in words is "three hundred eighty-seven million, nine hundred twenty-one thousand, four hundred twenty-seven".