1342638657 has 6 divisors (see below), whose sum is σ = 1939366962. Its totient is φ = 895092432.

The previous prime is 1342638653. The next prime is 1342638691. The reversal of 1342638657 is 7568362431.

1342638657 is a `hidden beast` number, since 1 + 3 + 4 + 2 + 638 + 6 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 990738576 + 351900081 = 31476^2 + 18759^2 .

It is not a de Polignac number, because 1342638657 - 2² = 1342638653 is a prime.

It is a super-3 number, since 3×1342638657³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1342638653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74591028 + ... + 74591045.

It is an arithmetic number, because the mean of its divisors is an integer number (323227827).

Almost surely, 2^1342638657 is an apocalyptic number.

It is an amenable number.

1342638657 is a deficient number, since it is larger than the sum of its proper divisors (596728305).

1342638657 is a wasteful number, since it uses less digits than its factorization.

1342638657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149182079 (or 149182076 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 1342638657 is about 36642.0340183238. The cubic root of 1342638657 is about 1103.1969412934.

The spelling of 1342638657 in words is "one billion, three hundred forty-two million, six hundred thirty-eight thousand, six hundred fifty-seven".