815427420739 has 32 divisors (see below), whose sum is σ = 877309392960. Its totient is φ = 755183480832.

The previous prime is 815427420721. The next prime is 815427420751. The reversal of 815427420739 is 937024724518.

It is a de Polignac number, because none of the positive numbers 2^k-815427420739 is a prime.

It is a super-2 number, since 2×815427420739² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815427420239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470528517 + ... + 470530249.

It is an arithmetic number, because the mean of its divisors is an integer number (27415918530).

Almost surely, 2^815427420739 is an apocalyptic number.

815427420739 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

815427420739 is a deficient number, since it is larger than the sum of its proper divisors (61881972221).

815427420739 is a wasteful number, since it uses less digits than its factorization.

815427420739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 815427420739 in words is "eight hundred fifteen billion, four hundred twenty-seven million, four hundred twenty thousand, seven hundred thirty-nine".