387651381 has 48 divisors (see below), whose sum is σ = 589994496. Its totient is φ = 224969472.

The previous prime is 387651379. The next prime is 387651421. The reversal of 387651381 is 183156783.

It is not a de Polignac number, because 387651381 - 2¹ = 387651379 is a prime.

It is a super-2 number, since 2×387651381² = 300547186382414322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387651581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1738236 + ... + 1738458.

It is an arithmetic number, because the mean of its divisors is an integer number (12291552).

Almost surely, 2^387651381 is an apocalyptic number.

It is an amenable number.

387651381 is a deficient number, since it is larger than the sum of its proper divisors (202343115).

387651381 is a wasteful number, since it uses less digits than its factorization.

387651381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 321 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 387651381 is about 19688.8643908175. The cubic root of 387651381 is about 729.1447925839.

The spelling of 387651381 in words is "three hundred eighty-seven million, six hundred fifty-one thousand, three hundred eighty-one".