406400254 has 16 divisors (see below), whose sum is σ = 661667328. Its totient is φ = 186090912.

The previous prime is 406400219. The next prime is 406400257. The reversal of 406400254 is 452004604.

It is a super-2 number, since 2×406400254² = 330322332902529032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406400257) 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, 58237 + ... + 64840.

It is an arithmetic number, because the mean of its divisors is an integer number (41354208).

Almost surely, 2^406400254 is an apocalyptic number.

406400254 is a deficient number, since it is larger than the sum of its proper divisors (255267074).

406400254 is a wasteful number, since it uses less digits than its factorization.

406400254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123219.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 406400254 is about 20159.3713691672. The cubic root of 406400254 is about 740.7153139260.

Adding to 406400254 its reverse (452004604), we get a palindrome (858404858).

It can be divided in two parts, 406400 and 254, that multiplied together give a square (103225600 = 10160²).

The spelling of 406400254 in words is "four hundred six million, four hundred thousand, two hundred fifty-four".