740021431 has 2 divisors, whose sum is σ = 740021432. Its totient is φ = 740021430.

The previous prime is 740021393. The next prime is 740021453. The reversal of 740021431 is 134120047.

It is an a-pointer prime, because the next prime (740021453) can be obtained adding 740021431 to its sum of digits (22).

It is a strong prime.

It is an emirp because it is prime and its reverse (134120047) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740021431 is a prime.

It is a super-2 number, since 2×740021431² = 1095263436678575522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740021461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370010715 + 370010716.

It is an arithmetic number, because the mean of its divisors is an integer number (370010716).

Almost surely, 2^740021431 is an apocalyptic number.

740021431 is a deficient number, since it is larger than the sum of its proper divisors (1).

740021431 is an equidigital number, since it uses as much as digits as its factorization.

740021431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 740021431 is about 27203.3349242331. The cubic root of 740021431 is about 904.5129012914.

Adding to 740021431 its reverse (134120047), we get a palindrome (874141478).

The spelling of 740021431 in words is "seven hundred forty million, twenty-one thousand, four hundred thirty-one".