1401509916 has 18 divisors (see below), whose sum is σ = 3542705712. Its totient is φ = 467169960.

The previous prime is 1401509891. The next prime is 1401509917. The reversal of 1401509916 is 6199051041.

1401509916 is a `hidden beast` number, since 140 + 1 + 509 + 9 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38930831 = 1401509916 / (1 + 4 + 0 + 1 + 5 + 0 + 9 + 9 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401509917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19465380 + ... + 19465451.

It is an arithmetic number, because the mean of its divisors is an integer number (196816984).

Almost surely, 2^1401509916 is an apocalyptic number.

It is an amenable number.

1401509916 is an abundant number, since it is smaller than the sum of its proper divisors (2141195796).

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

1401509916 is a wasteful number, since it uses less digits than its factorization.

1401509916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38930841 (or 38930836 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1401509916 is about 37436.7455316297. The cubic root of 1401509916 is about 1119.0909705216.

The spelling of 1401509916 in words is "one billion, four hundred one million, five hundred nine thousand, nine hundred sixteen".