401728493 has 8 divisors (see below), whose sum is σ = 409512480. Its totient is φ = 393983280.

The previous prime is 401728423. The next prime is 401728501. The reversal of 401728493 is 394827104.

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 401728493 - 2⁸ = 401728237 is a prime.

It is a super-2 number, since 2×401728493² = 322771564176102098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401728423) 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, 11678 + ... + 30656.

It is an arithmetic number, because the mean of its divisors is an integer number (51189060).

Almost surely, 2^401728493 is an apocalyptic number.

It is an amenable number.

401728493 is a deficient number, since it is larger than the sum of its proper divisors (7783987).

401728493 is a wasteful number, since it uses less digits than its factorization.

401728493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19387.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 401728493 is about 20043.1657429659. The cubic root of 401728493 is about 737.8660784502.

The spelling of 401728493 in words is "four hundred one million, seven hundred twenty-eight thousand, four hundred ninety-three".