77421437 has 2 divisors, whose sum is σ = 77421438. Its totient is φ = 77421436.

The previous prime is 77421433. The next prime is 77421467. The reversal of 77421437 is 73412477.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43943641 + 33477796 = 6629^2 + 5786^2 .

It is a cyclic number.

It is not a de Polignac number, because 77421437 - 2² = 77421433 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77421397 and 77421406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77421431) 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, 38710718 + 38710719.

It is an arithmetic number, because the mean of its divisors is an integer number (38710719).

Almost surely, 2^77421437 is an apocalyptic number.

It is an amenable number.

77421437 is a deficient number, since it is larger than the sum of its proper divisors (1).

77421437 is an equidigital number, since it uses as much as digits as its factorization.

77421437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 35.

The square root of 77421437 is about 8798.9452208773. The cubic root of 77421437 is about 426.2068341779.

The spelling of 77421437 in words is "seventy-seven million, four hundred twenty-one thousand, four hundred thirty-seven".