154200421 has 8 divisors (see below), whose sum is σ = 165107160. Its totient is φ = 143497728.

The previous prime is 154200407. The next prime is 154200439. The reversal of 154200421 is 124002451.

It can be written as a sum of positive squares in 4 ways, for example, as 32649796 + 121550625 = 5714^2 + 11025^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154200421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154200491) 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 7 ways as a sum of consecutive naturals, for example, 49446 + ... + 52471.

It is an arithmetic number, because the mean of its divisors is an integer number (20638395).

Almost surely, 2^154200421 is an apocalyptic number.

It is an amenable number.

154200421 is a deficient number, since it is larger than the sum of its proper divisors (10906739).

154200421 is a wasteful number, since it uses less digits than its factorization.

154200421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102023.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 154200421 is about 12417.7462125782. The cubic root of 154200421 is about 536.2432680641.

Adding to 154200421 its reverse (124002451), we get a palindrome (278202872).

The spelling of 154200421 in words is "one hundred fifty-four million, two hundred thousand, four hundred twenty-one".