19145780 has 12 divisors (see below), whose sum is σ = 40206180. Its totient is φ = 7658304.

The previous prime is 19145767. The next prime is 19145801. The reversal of 19145780 is 8754191.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 10061584 = 3014^2 + 3172^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19145780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478625 + ... + 478664.

It is an arithmetic number, because the mean of its divisors is an integer number (3350515).

Almost surely, 2^19145780 is an apocalyptic number.

19145780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19145780 is an abundant number, since it is smaller than the sum of its proper divisors (21060400).

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

19145780 is a wasteful number, since it uses less digits than its factorization.

19145780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957298 (or 957296 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 19145780 is about 4375.5891031951. The cubic root of 19145780 is about 267.5208822898.

The spelling of 19145780 in words is "nineteen million, one hundred forty-five thousand, seven hundred eighty".