1220400143 has 4 divisors (see below), whose sum is σ = 1222203480. Its totient is φ = 1218596808.

The previous prime is 1220400107. The next prime is 1220400149. The reversal of 1220400143 is 3410040221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220400143 - 2²² = 1216205839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220400149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900653 + ... + 902006.

It is an arithmetic number, because the mean of its divisors is an integer number (305550870).

Almost surely, 2^1220400143 is an apocalyptic number.

1220400143 is a deficient number, since it is larger than the sum of its proper divisors (1803337).

1220400143 is an equidigital number, since it uses as much as digits as its factorization.

1220400143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803336.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1220400143 is about 34934.2259539266. The cubic root of 1220400143 is about 1068.6465383334.

Adding to 1220400143 its reverse (3410040221), we get a palindrome (4630440364).

The spelling of 1220400143 in words is "one billion, two hundred twenty million, four hundred thousand, one hundred forty-three".