154388721 has 8 divisors (see below), whose sum is σ = 212950080. Its totient is φ = 99376592.

The previous prime is 154388683. The next prime is 154388723. The reversal of 154388721 is 127883451.

154388721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 154388721 - 2⁷ = 154388593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 154388721.

It is not an unprimeable number, because it can be changed into a prime (154388723) 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, 887205 + ... + 887378.

It is an arithmetic number, because the mean of its divisors is an integer number (26618760).

Almost surely, 2^154388721 is an apocalyptic number.

It is an amenable number.

154388721 is a deficient number, since it is larger than the sum of its proper divisors (58561359).

154388721 is a wasteful number, since it uses less digits than its factorization.

154388721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774615.

The product of its digits is 53760, while the sum is 39.

The square root of 154388721 is about 12425.3257904974. The cubic root of 154388721 is about 536.4614549606.

The spelling of 154388721 in words is "one hundred fifty-four million, three hundred eighty-eight thousand, seven hundred twenty-one".