398401265 has 8 divisors (see below), whose sum is σ = 487102248. Its totient is φ = 312707200.

The previous prime is 398401247. The next prime is 398401279. The reversal of 398401265 is 562104893.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 63218401 + 335182864 = 7951^2 + 18308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398401265 - 2²² = 394206961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751436 + ... + 751965.

It is an arithmetic number, because the mean of its divisors is an integer number (60887781).

Almost surely, 2^398401265 is an apocalyptic number.

It is an amenable number.

398401265 is a deficient number, since it is larger than the sum of its proper divisors (88700983).

398401265 is a wasteful number, since it uses less digits than its factorization.

398401265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503459.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 398401265 is about 19959.9916082147. The cubic root of 398401265 is about 735.8233573259.

The spelling of 398401265 in words is "three hundred ninety-eight million, four hundred one thousand, two hundred sixty-five".