1401666320 has 40 divisors (see below), whose sum is σ = 3450576024. Its totient is φ = 527685632.

The previous prime is 1401666319. The next prime is 1401666323. The reversal of 1401666320 is 236661041.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 83685904 + 1317980416 = 9148^2 + 36304^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1401666323) 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, 513959 + ... + 516678.

Almost surely, 2^1401666320 is an apocalyptic number.

1401666320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401666320 is an abundant number, since it is smaller than the sum of its proper divisors (2048909704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1401666320 is a wasteful number, since it uses less digits than its factorization.

1401666320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030667 (or 1030661 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1401666320 is about 37438.8343835649. The cubic root of 1401666320 is about 1119.1325979578.

The spelling of 1401666320 in words is "one billion, four hundred one million, six hundred sixty-six thousand, three hundred twenty".