19949400 has 72 divisors (see below), whose sum is σ = 67002780. Its totient is φ = 5319360.

The previous prime is 19949393. The next prime is 19949429. The reversal of 19949400 is 494991.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 3742 + ... + 7341.

Almost surely, 2^19949400 is an apocalyptic number.

19949400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19949400 is an abundant number, since it is smaller than the sum of its proper divisors (47053380).

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

19949400 is a wasteful number, since it uses less digits than its factorization.

19949400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11105 (or 11093 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19949400 is about 4466.4751202710. The cubic root of 19949400 is about 271.2126524496.

The spelling of 19949400 in words is "nineteen million, nine hundred forty-nine thousand, four hundred".