154434421 has 8 divisors (see below), whose sum is σ = 158487840. Its totient is φ = 150423312.

The previous prime is 154434359. The next prime is 154434431. The reversal of 154434421 is 124434451.

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-154434421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 154434421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154434431) 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, 3115 + ... + 17848.

It is an arithmetic number, because the mean of its divisors is an integer number (19810980).

Almost surely, 2^154434421 is an apocalyptic number.

It is an amenable number.

154434421 is a deficient number, since it is larger than the sum of its proper divisors (4053419).

154434421 is a wasteful number, since it uses less digits than its factorization.

154434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21155.

The product of its digits is 7680, while the sum is 28.

The square root of 154434421 is about 12427.1646404158. The cubic root of 154434421 is about 536.5143816894.

Adding to 154434421 its reverse (124434451), we get a palindrome (278868872).

The spelling of 154434421 in words is "one hundred fifty-four million, four hundred thirty-four thousand, four hundred twenty-one".