1277646342 has 32 divisors (see below), whose sum is σ = 2968214784. Its totient is φ = 359056800.

The previous prime is 1277646341. The next prime is 1277646367. The reversal of 1277646342 is 2436467721.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1277646294 and 1277646303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277646341) 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 in 15 ways as a sum of consecutive naturals, for example, 246784 + ... + 251907.

It is an arithmetic number, because the mean of its divisors is an integer number (92756712).

Almost surely, 2^1277646342 is an apocalyptic number.

1277646342 is an abundant number, since it is smaller than the sum of its proper divisors (1690568442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1277646342 is a wasteful number, since it uses less digits than its factorization.

1277646342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498764.

The product of its digits is 338688, while the sum is 42.

The square root of 1277646342 is about 35744.1791345108. The cubic root of 1277646342 is about 1085.1011371954.

The spelling of 1277646342 in words is "one billion, two hundred seventy-seven million, six hundred forty-six thousand, three hundred forty-two".