1406041821 has 20 divisors (see below), whose sum is σ = 2149234912. Its totient is φ = 915559848.

The previous prime is 1406041817. The next prime is 1406041841. The reversal of 1406041821 is 1281406041.

It is a happy number.

1406041821 is a `hidden beast` number, since 1 + 40 + 604 + 18 + 2 + 1 = 666.

It is not a de Polignac number, because 1406041821 - 2² = 1406041817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406041811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 198361 + ... + 205326.

Almost surely, 2^1406041821 is an apocalyptic number.

It is an amenable number.

1406041821 is a deficient number, since it is larger than the sum of its proper divisors (743193091).

1406041821 is an equidigital number, since it uses as much as digits as its factorization.

1406041821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403742 (or 403733 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1406041821 is about 37497.2241772641. The cubic root of 1406041821 is about 1120.2958989119.

Adding to 1406041821 its reverse (1281406041), we get a palindrome (2687447862).

The spelling of 1406041821 in words is "one billion, four hundred six million, forty-one thousand, eight hundred twenty-one".