1406244681 has 36 divisors (see below), whose sum is σ = 2115022468. Its totient is φ = 899698752.

The previous prime is 1406244677. The next prime is 1406244703. The reversal of 1406244681 is 1864426041.

It is a happy number.

1406244681 is a `hidden beast` number, since 1 + 406 + 244 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 513430281 + 892814400 = 22659^2 + 29880^2 .

It is not a de Polignac number, because 1406244681 - 2² = 1406244677 is a prime.

It is a super-2 number, since 2×1406244681² = 3955048205681583522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1406744681) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2293731 + ... + 2294343.

Almost surely, 2^1406244681 is an apocalyptic number.

It is an amenable number.

1406244681 is a deficient number, since it is larger than the sum of its proper divisors (708777787).

1406244681 is an equidigital number, since it uses as much as digits as its factorization.

1406244681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 1406244681 is about 37499.9290799329. The cubic root of 1406244681 is about 1120.3497740987.

The spelling of 1406244681 in words is "one billion, four hundred six million, two hundred forty-four thousand, six hundred eighty-one".