138056899 has 8 divisors (see below), whose sum is σ = 139729968. Its totient is φ = 136389120.

The previous prime is 138056887. The next prime is 138056903. The reversal of 138056899 is 998650831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138056899 - 2¹⁹ = 137532611 is a prime.

It is a super-2 number, since 2×138056899² = 38119414722992402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138056999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79359 + ... + 81079.

It is an arithmetic number, because the mean of its divisors is an integer number (17466246).

Almost surely, 2^138056899 is an apocalyptic number.

138056899 is a deficient number, since it is larger than the sum of its proper divisors (1673069).

138056899 is an equidigital number, since it uses as much as digits as its factorization.

138056899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 138056899 is about 11749.7616571571. The cubic root of 138056899 is about 516.8359382008.

The spelling of 138056899 in words is "one hundred thirty-eight million, fifty-six thousand, eight hundred ninety-nine".