401745421 has 16 divisors (see below), whose sum is σ = 501321600. Its totient is φ = 312770880.

The previous prime is 401745401. The next prime is 401745433. The reversal of 401745421 is 124547104.

It is a cyclic number.

It is not a de Polignac number, because 401745421 - 2²¹ = 399648269 is a prime.

It is a super-2 number, since 2×401745421² = 322798766588934482, which contains 22 as substring.

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 401745421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401745401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148735 + ... + 151411.

It is an arithmetic number, because the mean of its divisors is an integer number (31332600).

Almost surely, 2^401745421 is an apocalyptic number.

It is an amenable number.

401745421 is a deficient number, since it is larger than the sum of its proper divisors (99576179).

401745421 is a wasteful number, since it uses less digits than its factorization.

401745421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4644.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 401745421 is about 20043.5880270973. The cubic root of 401745421 is about 737.8764423500.

The spelling of 401745421 in words is "four hundred one million, seven hundred forty-five thousand, four hundred twenty-one".