72435431 has 2 divisors, whose sum is σ = 72435432. Its totient is φ = 72435430.

The previous prime is 72435427. The next prime is 72435449. The reversal of 72435431 is 13453427.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72435431 - 2² = 72435427 is a prime.

It is a super-2 number, since 2×72435431² = 10493783328311522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72435394 and 72435403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72435401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36217715 + 36217716.

It is an arithmetic number, because the mean of its divisors is an integer number (36217716).

Almost surely, 2^72435431 is an apocalyptic number.

72435431 is a deficient number, since it is larger than the sum of its proper divisors (1).

72435431 is an equidigital number, since it uses as much as digits as its factorization.

72435431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 29.

The square root of 72435431 is about 8510.9007161404. The cubic root of 72435431 is about 416.8537213106.

Adding to 72435431 its reverse (13453427), we get a palindrome (85888858).

The spelling of 72435431 in words is "seventy-two million, four hundred thirty-five thousand, four hundred thirty-one".