398207390 has 32 divisors (see below), whose sum is σ = 832607424. Its totient is φ = 134288640.

The previous prime is 398207389. The next prime is 398207399. The reversal of 398207390 is 93702893.

It is a super-2 number, since 2×398207390² = 317138250901224200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398207399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42359 + ... + 50898.

It is an arithmetic number, because the mean of its divisors is an integer number (26018982).

Almost surely, 2^398207390 is an apocalyptic number.

398207390 is an abundant number, since it is smaller than the sum of its proper divisors (434400034).

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

398207390 is a wasteful number, since it uses less digits than its factorization.

398207390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93332.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 398207390 is about 19955.1344270090. The cubic root of 398207390 is about 735.7039794417.

The spelling of 398207390 in words is "three hundred ninety-eight million, two hundred seven thousand, three hundred ninety".