1331405402 has 8 divisors (see below), whose sum is σ = 2002139796. Its totient is φ = 664025472.

The previous prime is 1331405381. The next prime is 1331405429. The reversal of 1331405402 is 2045041331.

It can be written as a sum of positive squares in 2 ways, for example, as 1117631761 + 213773641 = 33431^2 + 14621^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837623 + ... + 839210.

Almost surely, 2^1331405402 is an apocalyptic number.

1331405402 is a deficient number, since it is larger than the sum of its proper divisors (670734394).

1331405402 is a wasteful number, since it uses less digits than its factorization.

1331405402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677232.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1331405402 is about 36488.4283300884. The cubic root of 1331405402 is about 1100.1116696549. Note that the first 3 decimals are identical.

Adding to 1331405402 its reverse (2045041331), we get a palindrome (3376446733).

The spelling of 1331405402 in words is "one billion, three hundred thirty-one million, four hundred five thousand, four hundred two".