1242320409 has 20 divisors (see below), whose sum is σ = 2024523600. Its totient is φ = 752920920.

The previous prime is 1242320383. The next prime is 1242320411. The reversal of 1242320409 is 9040232421.

1242320409 is a `hidden beast` number, since 1 + 24 + 232 + 0 + 409 = 666.

It is not a de Polignac number, because 1242320409 - 2⁸ = 1242320153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1242320479) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 696259 + ... + 698040.

It is an arithmetic number, because the mean of its divisors is an integer number (101226180).

Almost surely, 2^1242320409 is an apocalyptic number.

It is an amenable number.

1242320409 is a deficient number, since it is larger than the sum of its proper divisors (782203191).

1242320409 is a wasteful number, since it uses less digits than its factorization.

1242320409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394322 (or 1394313 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1242320409 is about 35246.5659178309. The cubic root of 1242320409 is about 1075.0067882030.

The spelling of 1242320409 in words is "one billion, two hundred forty-two million, three hundred twenty thousand, four hundred nine".