390143280 has 80 divisors (see below), whose sum is σ = 1213565184. Its totient is φ = 103683840.

The previous prime is 390143279. The next prime is 390143363. The reversal of 390143280 is 82341093.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72027 + ... + 77253.

Almost surely, 2^390143280 is an apocalyptic number.

390143280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390143280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606782592).

390143280 is an abundant number, since it is smaller than the sum of its proper divisors (823421904).

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

390143280 is a wasteful number, since it uses less digits than its factorization.

390143280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5554 (or 5548 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 390143280 is about 19752.0449574215. The cubic root of 390143280 is about 730.7038186098.

The spelling of 390143280 in words is "three hundred ninety million, one hundred forty-three thousand, two hundred eighty".