405661254 has 16 divisors (see below), whose sum is σ = 812980800. Its totient is φ = 134944040.

The previous prime is 405661253. The next prime is 405661261. The reversal of 405661254 is 452166504.

It is a super-2 number, since 2×405661254² = 329122105993705032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405661253) 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, 65904 + ... + 71795.

It is an arithmetic number, because the mean of its divisors is an integer number (50811300).

Almost surely, 2^405661254 is an apocalyptic number.

405661254 is an abundant number, since it is smaller than the sum of its proper divisors (407319546).

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

405661254 is a wasteful number, since it uses less digits than its factorization.

405661254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138195.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 405661254 is about 20141.0340846740. The cubic root of 405661254 is about 740.2660681899.

The spelling of 405661254 in words is "four hundred five million, six hundred sixty-one thousand, two hundred fifty-four".