19097540 has 48 divisors (see below), whose sum is σ = 50004864. Its totient is φ = 5952000.

The previous prime is 19097537. The next prime is 19097593. The reversal of 19097540 is 4579091.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 19097540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4661 + ... + 7740.

It is an arithmetic number, because the mean of its divisors is an integer number (1041768).

Almost surely, 2^19097540 is an apocalyptic number.

19097540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19097540 is an abundant number, since it is smaller than the sum of its proper divisors (30907324).

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

19097540 is a wasteful number, since it uses less digits than its factorization.

19097540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12428 (or 12426 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 19097540 is about 4370.0732259311. The cubic root of 19097540 is about 267.2960100851.

It can be divided in two parts, 1909 and 7540, that added together give a palindrome (9449).

The spelling of 19097540 in words is "nineteen million, ninety-seven thousand, five hundred forty".