19891092 has 24 divisors (see below), whose sum is σ = 49983136. Its totient is φ = 6120288.

The previous prime is 19891073. The next prime is 19891099. The reversal of 19891092 is 29019891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 19891092.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19891099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63598 + ... + 63909.

Almost surely, 2^19891092 is an apocalyptic number.

19891092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19891092 is an abundant number, since it is smaller than the sum of its proper divisors (30092044).

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

19891092 is a wasteful number, since it uses less digits than its factorization.

19891092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127527 (or 127525 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 19891092 is about 4459.9430489637. The cubic root of 19891092 is about 270.9481616328.

It can be divided in two parts, 1989 and 1092, that added together give a triangular number (3081 = T₇₈).

The spelling of 19891092 in words is "nineteen million, eight hundred ninety-one thousand, ninety-two".