405740220 has 24 divisors (see below), whose sum is σ = 1136072784. Its totient is φ = 108197376.

The previous prime is 405740201. The next prime is 405740239. The reversal of 405740220 is 22047504.

It is an interprime number because it is at equal distance from previous prime (405740201) and next prime (405740239).

It is a super-2 number, since 2×405740220² = 329250252251296800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3381109 + ... + 3381228.

It is an arithmetic number, because the mean of its divisors is an integer number (47336366).

Almost surely, 2^405740220 is an apocalyptic number.

It is an amenable number.

405740220 is an abundant number, since it is smaller than the sum of its proper divisors (730332564).

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

405740220 is a wasteful number, since it uses less digits than its factorization.

405740220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762349 (or 6762347 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 405740220 is about 20142.9943156423. The cubic root of 405740220 is about 740.3140984591.

Adding to 405740220 its reverse (22047504), we get a palindrome (427787724).

The spelling of 405740220 in words is "four hundred five million, seven hundred forty thousand, two hundred twenty".