387721337 has 4 divisors (see below), whose sum is σ = 387766656. Its totient is φ = 387676020.

The previous prime is 387721331. The next prime is 387721349. The reversal of 387721337 is 733127783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 733127783 = 23 ⋅31875121.

It is a cyclic number.

It is not a de Polignac number, because 387721337 - 2¹⁴ = 387704953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 387721294 and 387721303.

It is not an unprimeable number, because it can be changed into a prime (387721331) 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, 5489 + ... + 28382.

It is an arithmetic number, because the mean of its divisors is an integer number (96941664).

Almost surely, 2^387721337 is an apocalyptic number.

It is an amenable number.

387721337 is a deficient number, since it is larger than the sum of its proper divisors (45319).

387721337 is a wasteful number, since it uses less digits than its factorization.

387721337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45318.

The product of its digits is 148176, while the sum is 41.

The square root of 387721337 is about 19690.6408478749. The cubic root of 387721337 is about 729.1886507063.

The spelling of 387721337 in words is "three hundred eighty-seven million, seven hundred twenty-one thousand, three hundred thirty-seven".