19700400 has 60 divisors (see below), whose sum is σ = 63110792. Its totient is φ = 5253120.

The previous prime is 19700363. The next prime is 19700449. The reversal of 19700400 is 400791.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7009 + ... + 9408.

Almost surely, 2^19700400 is an apocalyptic number.

19700400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19700400 is an abundant number, since it is smaller than the sum of its proper divisors (43410392).

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

19700400 is a wasteful number, since it uses less digits than its factorization.

19700400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16438 (or 16427 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 19700400 is about 4438.5132645966. The cubic root of 19700400 is about 270.0795376097.

It can be divided in two parts, 19700 and 400, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 19700400 in words is "nineteen million, seven hundred thousand, four hundred".