1140343421 has 4 divisors (see below), whose sum is σ = 1303249632. Its totient is φ = 977437212.

The previous prime is 1140343411. The next prime is 1140343471. The reversal of 1140343421 is 1243430411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1243430411 = 41 ⋅30327571.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1140343421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1140343411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81453095 + ... + 81453108.

It is an arithmetic number, because the mean of its divisors is an integer number (325812408).

Almost surely, 2^1140343421 is an apocalyptic number.

It is an amenable number.

1140343421 is a deficient number, since it is larger than the sum of its proper divisors (162906211).

1140343421 is an equidigital number, since it uses as much as digits as its factorization.

1140343421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162906210.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1140343421 is about 33768.9712754179. The cubic root of 1140343421 is about 1044.7488147298.

Adding to 1140343421 its reverse (1243430411), we get a palindrome (2383773832).

The spelling of 1140343421 in words is "one billion, one hundred forty million, three hundred forty-three thousand, four hundred twenty-one".