120405731 has 2 divisors, whose sum is σ = 120405732. Its totient is φ = 120405730.

The previous prime is 120405683. The next prime is 120405749. The reversal of 120405731 is 137504021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120405731 is a prime.

It is a super-2 number, since 2×120405731² = 28995080115288722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 120405697 and 120405706.

It is not a weakly prime, because it can be changed into another prime (120405331) by changing a digit.

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 as a sum of consecutive naturals, namely, 60202865 + 60202866.

It is an arithmetic number, because the mean of its divisors is an integer number (60202866).

Almost surely, 2^120405731 is an apocalyptic number.

120405731 is a deficient number, since it is larger than the sum of its proper divisors (1).

120405731 is an equidigital number, since it uses as much as digits as its factorization.

120405731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 120405731 is about 10972.9545246483. The cubic root of 120405731 is about 493.7976887977.

Adding to 120405731 its reverse (137504021), we get a palindrome (257909752).

It can be divided in two parts, 12040 and 5731, that added together give a palindrome (17771).

The spelling of 120405731 in words is "one hundred twenty million, four hundred five thousand, seven hundred thirty-one".