243401403 has 16 divisors (see below), whose sum is σ = 371381760. Its totient is φ = 138904896.

The previous prime is 243401363. The next prime is 243401413. The reversal of 243401403 is 304104342.

It is not a de Polignac number, because 243401403 - 2¹² = 243397307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 243401403.

It is not an unprimeable number, because it can be changed into a prime (243401413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9826 + ... + 24152.

It is an arithmetic number, because the mean of its divisors is an integer number (23211360).

Almost surely, 2^243401403 is an apocalyptic number.

243401403 is a deficient number, since it is larger than the sum of its proper divisors (127980357).

243401403 is a wasteful number, since it uses less digits than its factorization.

243401403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15146.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243401403 is about 15601.3269627939. The cubic root of 243401403 is about 624.3685594941.

Adding to 243401403 its reverse (304104342), we get a palindrome (547505745).

The spelling of 243401403 in words is "two hundred forty-three million, four hundred one thousand, four hundred three".