154139984 has 20 divisors (see below), whose sum is σ = 301728084. Its totient is φ = 76274688.

The previous prime is 154139983. The next prime is 154139987. The reversal of 154139984 is 489931451.

It can be written as a sum of positive squares in 2 ways, for example, as 47224384 + 106915600 = 6872^2 + 10340^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154139983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48107 + ... + 51210.

Almost surely, 2^154139984 is an apocalyptic number.

It is an amenable number.

154139984 is a deficient number, since it is larger than the sum of its proper divisors (147588100).

154139984 is an equidigital number, since it uses as much as digits as its factorization.

154139984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99422 (or 99416 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 154139984 is about 12415.3124809648. The cubic root of 154139984 is about 536.1732008766.

The spelling of 154139984 in words is "one hundred fifty-four million, one hundred thirty-nine thousand, nine hundred eighty-four".