1954728421 has 8 divisors (see below), whose sum is σ = 1970901504. Its totient is φ = 1938574560.

The previous prime is 1954728401. The next prime is 1954728427. The reversal of 1954728421 is 1248274591.

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-1954728421 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 (1954728427) 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, 257340 + ... + 264826.

It is an arithmetic number, because the mean of its divisors is an integer number (246362688).

Almost surely, 2^1954728421 is an apocalyptic number.

It is an amenable number.

1954728421 is a deficient number, since it is larger than the sum of its proper divisors (16173083).

1954728421 is a wasteful number, since it uses less digits than its factorization.

1954728421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9611.

The product of its digits is 161280, while the sum is 43.

The square root of 1954728421 is about 44212.3107403357. The cubic root of 1954728421 is about 1250.3419695836.

The spelling of 1954728421 in words is "one billion, nine hundred fifty-four million, seven hundred twenty-eight thousand, four hundred twenty-one".