1400645556 has 18 divisors (see below), whose sum is σ = 3540520802. Its totient is φ = 466881840.

The previous prime is 1400645551. The next prime is 1400645557. The reversal of 1400645556 is 6555460041.

1400645556 is a `hidden beast` number, since 1 + 4 + 0 + 0 + 645 + 5 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1344395556 + 56250000 = 36666^2 + 7500^2 .

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: 38906821 = 1400645556 / (1 + 4 + 0 + 0 + 6 + 4 + 5 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1400645556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400645551) 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 5 ways as a sum of consecutive naturals, for example, 19453375 + ... + 19453446.

Almost surely, 2^1400645556 is an apocalyptic number.

It is an amenable number.

1400645556 is an abundant number, since it is smaller than the sum of its proper divisors (2139875246).

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

1400645556 is a wasteful number, since it uses less digits than its factorization.

1400645556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38906831 (or 38906826 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1400645556 is about 37425.1994784263. The cubic root of 1400645556 is about 1118.8608624114.

The spelling of 1400645556 in words is "one billion, four hundred million, six hundred forty-five thousand, five hundred fifty-six".