1401640555 has 32 divisors (see below), whose sum is σ = 1983582720. Its totient is φ = 930804480.

The previous prime is 1401640553. The next prime is 1401640577. The reversal of 1401640555 is 5550461041.

It is not a de Polignac number, because 1401640555 - 2¹ = 1401640553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1401640553) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 195952 + ... + 202978.

It is an arithmetic number, because the mean of its divisors is an integer number (61986960).

Almost surely, 2^1401640555 is an apocalyptic number.

1401640555 is a deficient number, since it is larger than the sum of its proper divisors (581942165).

1401640555 is a wasteful number, since it uses less digits than its factorization.

1401640555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1401640555 is about 37438.4902874034. The cubic root of 1401640555 is about 1119.1257407318.

The spelling of 1401640555 in words is "one billion, four hundred one million, six hundred forty thousand, five hundred fifty-five".