398253405 has 16 divisors (see below), whose sum is σ = 695133504. Its totient is φ = 193092480.

The previous prime is 398253371. The next prime is 398253437. The reversal of 398253405 is 504352893.

It is not a de Polignac number, because 398253405 - 2⁹ = 398252893 is a prime.

It is a congruent number.

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, 1206664 + ... + 1206993.

It is an arithmetic number, because the mean of its divisors is an integer number (43445844).

Almost surely, 2^398253405 is an apocalyptic number.

It is an amenable number.

398253405 is a deficient number, since it is larger than the sum of its proper divisors (296880099).

398253405 is a wasteful number, since it uses less digits than its factorization.

398253405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413676.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 398253405 is about 19956.2873551169. The cubic root of 398253405 is about 735.7323165307.

The spelling of 398253405 in words is "three hundred ninety-eight million, two hundred fifty-three thousand, four hundred five".