1401780445 has 8 divisors (see below), whose sum is σ = 1811531736. Its totient is φ = 1035160896.

The previous prime is 1401780371. The next prime is 1401780449. The reversal of 1401780445 is 5440871041.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 311063769 + 1090716676 = 17637^2 + 33026^2 .

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-1401780445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1401780445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401780449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10782862 + ... + 10782991.

It is an arithmetic number, because the mean of its divisors is an integer number (226441467).

Almost surely, 2^1401780445 is an apocalyptic number.

It is an amenable number.

1401780445 is a deficient number, since it is larger than the sum of its proper divisors (409751291).

1401780445 is a wasteful number, since it uses less digits than its factorization.

1401780445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21565871.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 1401780445 is about 37440.3585052280. The cubic root of 1401780445 is about 1119.1629707457.

The spelling of 1401780445 in words is "one billion, four hundred one million, seven hundred eighty thousand, four hundred forty-five".