1331640938 has 16 divisors (see below), whose sum is σ = 2015465760. Its totient is φ = 659833200.

The previous prime is 1331640911. The next prime is 1331640943. The reversal of 1331640938 is 8390461331.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214133 + ... + 220263.

It is an arithmetic number, because the mean of its divisors is an integer number (125966610).

Almost surely, 2^1331640938 is an apocalyptic number.

1331640938 is a deficient number, since it is larger than the sum of its proper divisors (683824822).

1331640938 is a wasteful number, since it uses less digits than its factorization.

1331640938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 1331640938 is about 36491.6557311394. The cubic root of 1331640938 is about 1100.1765386080.

The spelling of 1331640938 in words is "one billion, three hundred thirty-one million, six hundred forty thousand, nine hundred thirty-eight".