19913400 has 288 divisors, whose sum is σ = 77182560. Its totient is φ = 4561920.

The previous prime is 19913393. The next prime is 19913407. The reversal of 19913400 is 431991.

It is an interprime number because it is at equal distance from previous prime (19913393) and next prime (19913407).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19913407) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 538182 + ... + 538218.

It is an arithmetic number, because the mean of its divisors is an integer number (267995).

Almost surely, 2^19913400 is an apocalyptic number.

19913400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19913400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38591280).

19913400 is an abundant number, since it is smaller than the sum of its proper divisors (57269160).

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

19913400 is a wasteful number, since it uses less digits than its factorization.

19913400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 19913400 is about 4462.4432769504. The cubic root of 19913400 is about 271.0494138821.

The spelling of 19913400 in words is "nineteen million, nine hundred thirteen thousand, four hundred".