1200400405 has 8 divisors (see below), whose sum is σ = 1456666200. Its totient is φ = 949529856.

The previous prime is 1200400343. The next prime is 1200400417. The reversal of 1200400405 is 5040040021.

It can be written as a sum of positive squares in 4 ways, for example, as 33016516 + 1167383889 = 5746^2 + 34167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200400405 - 2¹³ = 1200392213 is a prime.

It is a super-2 number, since 2×1200400405² = 2881922264648328050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348320 + ... + 1349209.

It is an arithmetic number, because the mean of its divisors is an integer number (182083275).

Almost surely, 2^1200400405 is an apocalyptic number.

It is an amenable number.

1200400405 is a deficient number, since it is larger than the sum of its proper divisors (256265795).

1200400405 is an equidigital number, since it uses as much as digits as its factorization.

1200400405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697623.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1200400405 is about 34646.7950177213. The cubic root of 1200400405 is about 1062.7767487627.

Adding to 1200400405 its reverse (5040040021), we get a palindrome (6240440426).

The spelling of 1200400405 in words is "one billion, two hundred million, four hundred thousand, four hundred five".