1320940731 has 8 divisors (see below), whose sum is σ = 1921368384. Its totient is φ = 800570120.

The previous prime is 1320940717. The next prime is 1320940739. The reversal of 1320940731 is 1370490231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320940731 - 2¹⁰ = 1320939707 is a prime.

It is a super-2 number, since 2×1320940731² = 3489768829629628722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1320940739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20014221 + ... + 20014286.

It is an arithmetic number, because the mean of its divisors is an integer number (240171048).

Almost surely, 2^1320940731 is an apocalyptic number.

1320940731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320940731 is a deficient number, since it is larger than the sum of its proper divisors (600427653).

1320940731 is a wasteful number, since it uses less digits than its factorization.

1320940731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40028521.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1320940731 is about 36344.7483276470. The cubic root of 1320940731 is about 1097.2218409058.

The spelling of 1320940731 in words is "one billion, three hundred twenty million, nine hundred forty thousand, seven hundred thirty-one".