387721246 has 16 divisors (see below), whose sum is σ = 644856048. Its totient is φ = 173347200.

The previous prime is 387721237. The next prime is 387721253. The reversal of 387721246 is 642127783.

It is a junction number, because it is equal to n+sod(n) for n = 387721199 and 387721208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143115 + ... + 145798.

It is an arithmetic number, because the mean of its divisors is an integer number (40303503).

Almost surely, 2^387721246 is an apocalyptic number.

387721246 is a deficient number, since it is larger than the sum of its proper divisors (257134802).

387721246 is a wasteful number, since it uses less digits than its factorization.

387721246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288987.

The product of its digits is 112896, while the sum is 40.

The square root of 387721246 is about 19690.6385371323. The cubic root of 387721246 is about 729.1885936583.

The spelling of 387721246 in words is "three hundred eighty-seven million, seven hundred twenty-one thousand, two hundred forty-six".