401998545 has 96 divisors (see below), whose sum is σ = 804271104. Its totient is φ = 191289600.

The previous prime is 401998537. The next prime is 401998547. The reversal of 401998545 is 545899104.

401998545 is a `hidden beast` number, since 4 + 0 + 19 + 98 + 545 = 666.

It is not a de Polignac number, because 401998545 - 2³ = 401998537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 401998545.

It is not an unprimeable number, because it can be changed into a prime (401998547) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 489235 + ... + 490055.

It is an arithmetic number, because the mean of its divisors is an integer number (8377824).

Almost surely, 2^401998545 is an apocalyptic number.

401998545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

401998545 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

401998545 is a wasteful number, since it uses less digits than its factorization.

401998545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 401998545 is about 20049.9013713285. The cubic root of 401998545 is about 738.0313787967.

It can be divided in two parts, 4019985 and 45, that added together give a triangular number (4020030 = T₂₈₃₅).

The spelling of 401998545 in words is "four hundred one million, nine hundred ninety-eight thousand, five hundred forty-five".