1401781445 has 8 divisors (see below), whose sum is σ = 1727601144. Its totient is φ = 1091116224.

The previous prime is 1401781379. The next prime is 1401781457. The reversal of 1401781445 is 5441871041.

It can be written as a sum of positive squares in 4 ways, for example, as 780475969 + 621305476 = 27937^2 + 24926^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1401781445 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3788414 + ... + 3788783.

It is an arithmetic number, because the mean of its divisors is an integer number (215950143).

Almost surely, 2^1401781445 is an apocalyptic number.

It is an amenable number.

1401781445 is a deficient number, since it is larger than the sum of its proper divisors (325819699).

1401781445 is an equidigital number, since it uses as much as digits as its factorization.

1401781445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7577239.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 1401781445 is about 37440.3718597986. The cubic root of 1401781445 is about 1119.1632368745.

The spelling of 1401781445 in words is "one billion, four hundred one million, seven hundred eighty-one thousand, four hundred forty-five".