154139905 has 16 divisors (see below), whose sum is σ = 199240704. Its totient is φ = 114143040.

The previous prime is 154139903. The next prime is 154139911. The reversal of 154139905 is 509931451.

It is a happy number.

It is not a de Polignac number, because 154139905 - 2¹ = 154139903 is a prime.

It is a super-2 number, since 2×154139905² = 47518220626818050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154139903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18054 + ... + 25183.

It is an arithmetic number, because the mean of its divisors is an integer number (12452544).

Almost surely, 2^154139905 is an apocalyptic number.

It is an amenable number.

154139905 is a deficient number, since it is larger than the sum of its proper divisors (45100799).

154139905 is a wasteful number, since it uses less digits than its factorization.

154139905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43296.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 154139905 is about 12415.3092994093. The cubic root of 154139905 is about 536.1731092766.

The spelling of 154139905 in words is "one hundred fifty-four million, one hundred thirty-nine thousand, nine hundred five".