1211040402 has 64 divisors (see below), whose sum is σ = 2851873920. Its totient is φ = 337996800.

The previous prime is 1211040401. The next prime is 1211040409. The reversal of 1211040402 is 2040401121.

It is not an unprimeable number, because it can be changed into a prime (1211040401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462874 + ... + 465482.

It is an arithmetic number, because the mean of its divisors is an integer number (44560530).

Almost surely, 2^1211040402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211040402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425936960).

1211040402 is an abundant number, since it is smaller than the sum of its proper divisors (1640833518).

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

1211040402 is a wasteful number, since it uses less digits than its factorization.

1211040402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1211040402 is about 34800.0057758616. The cubic root of 1211040402 is about 1065.9075637903.

Adding to 1211040402 its reverse (2040401121), we get a palindrome (3251441523).

The spelling of 1211040402 in words is "one billion, two hundred eleven million, forty thousand, four hundred two".