495403821 has 24 divisors (see below), whose sum is σ = 782645760. Its totient is φ = 299472000.

The previous prime is 495403813. The next prime is 495403823. The reversal of 495403821 is 128304594.

It is not a de Polignac number, because 495403821 - 2³ = 495403813 is a prime.

It is a super-2 number, since 2×495403821² = 490849891722800082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (495403823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33460 + ... + 45938.

It is an arithmetic number, because the mean of its divisors is an integer number (32610240).

Almost surely, 2^495403821 is an apocalyptic number.

It is an amenable number.

495403821 is a deficient number, since it is larger than the sum of its proper divisors (287241939).

495403821 is a wasteful number, since it uses less digits than its factorization.

495403821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12897 (or 12894 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 495403821 is about 22257.6688132428. The cubic root of 495403821 is about 791.2610426497.

It can be divided in two parts, 49540 and 3821, that added together give a square (53361 = 231²).

The spelling of 495403821 in words is "four hundred ninety-five million, four hundred three thousand, eight hundred twenty-one".