19121880 has 32 divisors (see below), whose sum is σ = 57366000. Its totient is φ = 5099136.

The previous prime is 19121857. The next prime is 19121881. The reversal of 19121880 is 8812191.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121881) 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, 79555 + ... + 79794.

Almost surely, 2^19121880 is an apocalyptic number.

19121880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19121880 is an abundant number, since it is smaller than the sum of its proper divisors (38244120).

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

19121880 is a wasteful number, since it uses less digits than its factorization.

19121880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159363 (or 159359 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 19121880 is about 4372.8571895272. The cubic root of 19121880 is about 267.4095189953.

The spelling of 19121880 in words is "nineteen million, one hundred twenty-one thousand, eight hundred eighty".