390021248 has 16 divisors (see below), whose sum is σ = 776995710. Its totient is φ = 195010560.

The previous prime is 390021197. The next prime is 390021253. The reversal of 390021248 is 842120093.

It can be written as a sum of positive squares in only one way, i.e., 248125504 + 141895744 = 15752^2 + 11912^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 390021248.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1523393 + ... + 1523648.

Almost surely, 2^390021248 is an apocalyptic number.

It is an amenable number.

390021248 is a deficient number, since it is larger than the sum of its proper divisors (386974462).

390021248 is an equidigital number, since it uses as much as digits as its factorization.

390021248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047055 (or 3047043 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 390021248 is about 19748.9556179561. The cubic root of 390021248 is about 730.6276256216.

The spelling of 390021248 in words is "three hundred ninety million, twenty-one thousand, two hundred forty-eight".