390128438 has 32 divisors (see below), whose sum is σ = 702245376. Its totient is φ = 158925888.

The previous prime is 390128437. The next prime is 390128513. The reversal of 390128438 is 834821093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390128437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48770 + ... + 56202.

It is an arithmetic number, because the mean of its divisors is an integer number (21945168).

Almost surely, 2^390128438 is an apocalyptic number.

390128438 is a deficient number, since it is larger than the sum of its proper divisors (312116938).

390128438 is a wasteful number, since it uses less digits than its factorization.

390128438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 390128438 is about 19751.6692459144. The cubic root of 390128438 is about 730.6945525751.

The spelling of 390128438 in words is "three hundred ninety million, one hundred twenty-eight thousand, four hundred thirty-eight".