4019940409 has 27 divisors (see below), whose sum is σ = 4396755621. Its totient is φ = 3674837880.

The previous prime is 4019940401. The next prime is 4019940427. The reversal of 4019940409 is 9040499104.

The square root of 4019940409 is 63403.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 4019940409 - 2³ = 4019940401 is a prime.

It is a super-2 number, since 2×4019940409² = 32319841783822174562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4019940401) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 56618844 + ... + 56618914.

Almost surely, 2^4019940409 is an apocalyptic number.

4019940409 is the 63403-rd square number.

4019940409 is the 31702-nd centered octagonal number.

It is an amenable number.

4019940409 is a deficient number, since it is larger than the sum of its proper divisors (376815212).

4019940409 is an frugal number, since it uses more digits than its factorization.

4019940409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The cubic root of 4019940409 is about 1590.0344663757.

Multiplying 4019940409 by its product of nonzero digits (46656), we get a square (187554339722304 = 13695048²).

It can be divided in two parts, 40199 and 40409, that added together give a palindrome (80608).

The spelling of 4019940409 in words is "four billion, nineteen million, nine hundred forty thousand, four hundred nine".