405891025 has 24 divisors (see below), whose sum is σ = 518163264. Its totient is φ = 315268800.

The previous prime is 405890993. The next prime is 405891077. The reversal of 405891025 is 520198504.

It is not a de Polignac number, because 405891025 - 2⁵ = 405890993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117219 + ... + 120631.

It is an arithmetic number, because the mean of its divisors is an integer number (21590136).

Almost surely, 2^405891025 is an apocalyptic number.

It is an amenable number.

405891025 is a deficient number, since it is larger than the sum of its proper divisors (112272239).

405891025 is a wasteful number, since it uses less digits than its factorization.

405891025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561 (or 3556 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 405891025 is about 20146.7373289076. The cubic root of 405891025 is about 740.4058067601.

It can be divided in two parts, 40589 and 1025, that added together give a palindrome (41614).

The spelling of 405891025 in words is "four hundred five million, eight hundred ninety-one thousand, twenty-five".