387721224 has 192 divisors, whose sum is σ = 1197218880. Its totient is φ = 112320000.

The previous prime is 387721211. The next prime is 387721237. The reversal of 387721224 is 422127783.

It is an interprime number because it is at equal distance from previous prime (387721211) and next prime (387721237).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2959639 + ... + 2959769.

It is an arithmetic number, because the mean of its divisors is an integer number (6235515).

Almost surely, 2^387721224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 387721224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (598609440).

387721224 is an abundant number, since it is smaller than the sum of its proper divisors (809497656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

387721224 is a wasteful number, since it uses less digits than its factorization.

387721224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 285 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 387721224 is about 19690.6379784912. The cubic root of 387721224 is about 729.1885798664.

The spelling of 387721224 in words is "three hundred eighty-seven million, seven hundred twenty-one thousand, two hundred twenty-four".