1235940021439 has 4 divisors (see below), whose sum is σ = 1235964948640. Its totient is φ = 1235915094240.

The previous prime is 1235940021401. The next prime is 1235940021443. The reversal of 1235940021439 is 9341200495321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1235940021439 - 2²⁷ = 1235805803711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1235940021395 and 1235940021404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235940021469) 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, 12389079 + ... + 12488440.

It is an arithmetic number, because the mean of its divisors is an integer number (308991237160).

Almost surely, 2^{1235940021439} is an apocalyptic number.

1235940021439 is a deficient number, since it is larger than the sum of its proper divisors (24927201).

1235940021439 is an equidigital number, since it uses as much as digits as its factorization.

1235940021439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24927200.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 1235940021439 in words is "one trillion, two hundred thirty-five billion, nine hundred forty million, twenty-one thousand, four hundred thirty-nine".