1200420431 has 16 divisors (see below), whose sum is σ = 1398988800. Its totient is φ = 1008718368.

The previous prime is 1200420407. The next prime is 1200420433. The reversal of 1200420431 is 1340240021.

It is a de Polignac number, because none of the positive numbers 2^k-1200420431 is a prime.

It is a super-2 number, since 2×1200420431² = 2882018422324451522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200420433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154385 + ... + 161973.

It is an arithmetic number, because the mean of its divisors is an integer number (87436800).

Almost surely, 2^1200420431 is an apocalyptic number.

1200420431 is a deficient number, since it is larger than the sum of its proper divisors (198568369).

1200420431 is an equidigital number, since it uses as much as digits as its factorization.

1200420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8038.

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

The square root of 1200420431 is about 34647.0840187165. The cubic root of 1200420431 is about 1062.7826587487.

Adding to 1200420431 its reverse (1340240021), we get a palindrome (2540660452).

The spelling of 1200420431 in words is "one billion, two hundred million, four hundred twenty thousand, four hundred thirty-one".