2193418440 has 80 divisors (see below), whose sum is σ = 7372333980. Its totient is φ = 584910720.

The previous prime is 2193418427. The next prime is 2193418441. The reversal of 2193418440 is 448143912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2151660996 + 41757444 = 46386^2 + 6462^2 .

It is a super-2 number, since 2×2193418440² = 9622168905864067200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2193418395 and 2193418404.

It is not an unprimeable number, because it can be changed into a prime (2193418441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 335251 + ... + 341730.

Almost surely, 2^2193418440 is an apocalyptic number.

2193418440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2193418440 is an abundant number, since it is smaller than the sum of its proper divisors (5178915540).

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

2193418440 is a wasteful number, since it uses less digits than its factorization.

2193418440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677004 (or 676991 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 2193418440 is about 46833.9453815286. The cubic root of 2193418440 is about 1299.2931936903.

The spelling of 2193418440 in words is "two billion, one hundred ninety-three million, four hundred eighteen thousand, four hundred forty".