1321399154 has 16 divisors (see below), whose sum is σ = 2119074048. Its totient is φ = 615796032.

The previous prime is 1321399147. The next prime is 1321399169. The reversal of 1321399154 is 4519931231.

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 7 ways as a sum of consecutive naturals, for example, 185162 + ... + 192165.

It is an arithmetic number, because the mean of its divisors is an integer number (132442128).

Almost surely, 2^1321399154 is an apocalyptic number.

1321399154 is a deficient number, since it is larger than the sum of its proper divisors (797674894).

1321399154 is a wasteful number, since it uses less digits than its factorization.

1321399154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377449.

The product of its digits is 29160, while the sum is 38.

The square root of 1321399154 is about 36351.0543726038. The cubic root of 1321399154 is about 1097.3487538805.

The spelling of 1321399154 in words is "one billion, three hundred twenty-one million, three hundred ninety-nine thousand, one hundred fifty-four".