405025521 has 8 divisors (see below), whose sum is σ = 540145824. Its totient is φ = 269961120.

The previous prime is 405025507. The next prime is 405025547. The reversal of 405025521 is 125520504.

It is a happy number.

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

It is not a de Polignac number, because 405025521 - 2⁶ = 405025457 is a prime.

It is a super-2 number, since 2×405025521² = 328091345322642882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 405025491 and 405025500.

It is not an unprimeable number, because it can be changed into a prime (405025591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7765 + ... + 29501.

It is an arithmetic number, because the mean of its divisors is an integer number (67518228).

Almost surely, 2^405025521 is an apocalyptic number.

It is an amenable number.

405025521 is a deficient number, since it is larger than the sum of its proper divisors (135120303).

405025521 is a wasteful number, since it uses less digits than its factorization.

405025521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27951.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 405025521 is about 20125.2458618522. The cubic root of 405025521 is about 739.8791627624.

The spelling of 405025521 in words is "four hundred five million, twenty-five thousand, five hundred twenty-one".