138214657 has 4 divisors (see below), whose sum is σ = 157959616. Its totient is φ = 118469700.

The previous prime is 138214651. The next prime is 138214663. The reversal of 138214657 is 756412831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756412831 = 233 ⋅3246407.

It is an interprime number because it is at equal distance from previous prime (138214651) and next prime (138214663).

It is a cyclic number.

It is not a de Polignac number, because 138214657 - 2¹¹ = 138212609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138214651) 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 3 ways as a sum of consecutive naturals, for example, 9872469 + ... + 9872482.

It is an arithmetic number, because the mean of its divisors is an integer number (39489904).

Almost surely, 2^138214657 is an apocalyptic number.

It is an amenable number.

138214657 is a deficient number, since it is larger than the sum of its proper divisors (19744959).

138214657 is an equidigital number, since it uses as much as digits as its factorization.

138214657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19744958.

The product of its digits is 40320, while the sum is 37.

The square root of 138214657 is about 11756.4729829996. The cubic root of 138214657 is about 517.0327265479.

The spelling of 138214657 in words is "one hundred thirty-eight million, two hundred fourteen thousand, six hundred fifty-seven".