19430900 has 18 divisors (see below), whose sum is σ = 42165270. Its totient is φ = 7772320.

The previous prime is 19430897. The next prime is 19430903. The reversal of 19430900 is 903491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19430897) and next prime (19430903).

It can be written as a sum of positive squares in 3 ways, for example, as 3254416 + 16176484 = 1804^2 + 4022^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19430900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19430903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 97055 + ... + 97254.

It is an arithmetic number, because the mean of its divisors is an integer number (2342515).

Almost surely, 2^19430900 is an apocalyptic number.

19430900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19430900 is an abundant number, since it is smaller than the sum of its proper divisors (22734370).

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

19430900 is a wasteful number, since it uses less digits than its factorization.

19430900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194323 (or 194316 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 19430900 is about 4408.0494552580. The cubic root of 19430900 is about 268.8423227069.

The spelling of 19430900 in words is "nineteen million, four hundred thirty thousand, nine hundred".