1220402340 has 36 divisors (see below), whose sum is σ = 3701887644. Its totient is φ = 325440576.

The previous prime is 1220402263. The next prime is 1220402363. The reversal of 1220402340 is 432040221.

1220402340 is a `hidden beast` number, since 1 + 220 + 402 + 3 + 40 = 666.

1220402340 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 308845476 + 911556864 = 17574^2 + 30192^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3389827 + ... + 3390186.

Almost surely, 2^1220402340 is an apocalyptic number.

1220402340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220402340 is an abundant number, since it is smaller than the sum of its proper divisors (2481485304).

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

1220402340 is a wasteful number, since it uses less digits than its factorization.

1220402340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780028 (or 6780023 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1220402340 is about 34934.2573987197. The cubic root of 1220402340 is about 1068.6471796026.

Adding to 1220402340 its reverse (432040221), we get a palindrome (1652442561).

The spelling of 1220402340 in words is "one billion, two hundred twenty million, four hundred two thousand, three hundred forty".