740393557 has 2 divisors, whose sum is σ = 740393558. Its totient is φ = 740393556.

The previous prime is 740393513. The next prime is 740393593. The reversal of 740393557 is 755393047.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 623450961 + 116942596 = 24969^2 + 10814^2 .

It is a cyclic number.

It is not a de Polignac number, because 740393557 - 2¹⁹ = 739869269 is a prime.

It is a super-2 number, since 2×740393557² = 1096365238494224498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740393597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370196778 + 370196779.

It is an arithmetic number, because the mean of its divisors is an integer number (370196779).

Almost surely, 2^740393557 is an apocalyptic number.

It is an amenable number.

740393557 is a deficient number, since it is larger than the sum of its proper divisors (1).

740393557 is an equidigital number, since it uses as much as digits as its factorization.

740393557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 396900, while the sum is 43.

The square root of 740393557 is about 27210.1737774679. The cubic root of 740393557 is about 904.6644898581.

The spelling of 740393557 in words is "seven hundred forty million, three hundred ninety-three thousand, five hundred fifty-seven".