1040238421 has 4 divisors (see below), whose sum is σ = 1040307532. Its totient is φ = 1040169312.

The previous prime is 1040238401. The next prime is 1040238427. The reversal of 1040238421 is 1248320401.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1248320401 = 43 ⋅29030707.

It can be written as a sum of positive squares in 2 ways, for example, as 152794321 + 887444100 = 12361^2 + 29790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040238421 - 2⁵ = 1040238389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040238427) 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, 1326 + ... + 45631.

It is an arithmetic number, because the mean of its divisors is an integer number (260076883).

Almost surely, 2^1040238421 is an apocalyptic number.

It is an amenable number.

1040238421 is a deficient number, since it is larger than the sum of its proper divisors (69111).

1040238421 is an equidigital number, since it uses as much as digits as its factorization.

1040238421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69110.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1040238421 is about 32252.7273420404. The cubic root of 1040238421 is about 1013.2368204937.

Adding to 1040238421 its reverse (1248320401), we get a palindrome (2288558822).

The spelling of 1040238421 in words is "one billion, forty million, two hundred thirty-eight thousand, four hundred twenty-one".