405726646 has 64 divisors (see below), whose sum is σ = 722534400. Its totient is φ = 169174656.

The previous prime is 405726637. The next prime is 405726649. The reversal of 405726646 is 646627504.

It is a super-2 number, since 2×405726646² = 329228222548818632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 405726599 and 405726608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405726649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1819291 + ... + 1819513.

It is an arithmetic number, because the mean of its divisors is an integer number (11289600).

Almost surely, 2^405726646 is an apocalyptic number.

405726646 is a deficient number, since it is larger than the sum of its proper divisors (316807754).

405726646 is a wasteful number, since it uses less digits than its factorization.

405726646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 405726646 is about 20142.6573718564. The cubic root of 405726646 is about 740.3058426547.

It can be divided in two parts, 4057 and 26646, that added together give a palindrome (30703).

The spelling of 405726646 in words is "four hundred five million, seven hundred twenty-six thousand, six hundred forty-six".