4209049840 has 40 divisors (see below), whose sum is σ = 10013631408. Its totient is φ = 1644464640.

The previous prime is 4209049807. The next prime is 4209049843. The reversal of 4209049840 is 489409024.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×4209049840² = 35432201111208051200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 4209049793 and 4209049802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4209049843) 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, 608341 + ... + 615220.

Almost surely, 2^4209049840 is an apocalyptic number.

4209049840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4209049840 is an abundant number, since it is smaller than the sum of its proper divisors (5804581568).

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

4209049840 is a wasteful number, since it uses less digits than its factorization.

4209049840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223617 (or 1223611 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 4209049840 is about 64877.1904447164. The cubic root of 4209049840 is about 1614.5866457387.

The spelling of 4209049840 in words is "four billion, two hundred nine million, forty-nine thousand, eight hundred forty".