1235378421 has 12 divisors (see below), whose sum is σ = 1827958860. Its totient is φ = 803497920.

The previous prime is 1235378413. The next prime is 1235378437. The reversal of 1235378421 is 1248735321.

1235378421 is a `hidden beast` number, since 1 + 23 + 537 + 84 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21622500 + 1213755921 = 4650^2 + 34839^2 .

It is not a de Polignac number, because 1235378421 - 2³ = 1235378413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235378411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1673586 + ... + 1674323.

It is an arithmetic number, because the mean of its divisors is an integer number (152329905).

Almost surely, 2^1235378421 is an apocalyptic number.

It is an amenable number.

1235378421 is a deficient number, since it is larger than the sum of its proper divisors (592580439).

1235378421 is a wasteful number, since it uses less digits than its factorization.

1235378421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347956 (or 3347953 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 1235378421 is about 35147.9504523379. The cubic root of 1235378421 is about 1073.0006960068. Note that the first 3 decimals are identical.

The spelling of 1235378421 in words is "one billion, two hundred thirty-five million, three hundred seventy-eight thousand, four hundred twenty-one".