1211404402 has 32 divisors (see below), whose sum is σ = 2001504960. Its totient is φ = 546471360.

The previous prime is 1211404379. The next prime is 1211404463. The reversal of 1211404402 is 2044041121.

It is a super-3 number, since 3×1211404402³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211404402.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 275473 + ... + 279835.

It is an arithmetic number, because the mean of its divisors is an integer number (62547030).

Almost surely, 2^1211404402 is an apocalyptic number.

1211404402 is a deficient number, since it is larger than the sum of its proper divisors (790100558).

1211404402 is a wasteful number, since it uses less digits than its factorization.

1211404402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4618.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1211404402 is about 34805.2352671261. The cubic root of 1211404402 is about 1066.0143456633.

Adding to 1211404402 its reverse (2044041121), we get a palindrome (3255445523).

The spelling of 1211404402 in words is "one billion, two hundred eleven million, four hundred four thousand, four hundred two".