19887434 has 12 divisors (see below), whose sum is σ = 34701714. Its totient is φ = 8523144.

The previous prime is 19887421. The next prime is 19887449. The reversal of 19887434 is 43478891.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 6175225 = 3703^2 + 2485^2 .

It is a super-2 number, since 2×19887434² = 791020062208712, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101369 + ... + 101564.

Almost surely, 2^19887434 is an apocalyptic number.

19887434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19887434 is a deficient number, since it is larger than the sum of its proper divisors (14814280).

19887434 is a wasteful number, since it uses less digits than its factorization.

19887434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202949 (or 202942 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 19887434 is about 4459.5329351850. The cubic root of 19887434 is about 270.9315513643.

The spelling of 19887434 in words is "nineteen million, eight hundred eighty-seven thousand, four hundred thirty-four".