401581428 has 24 divisors (see below), whose sum is σ = 937631520. Its totient is φ = 133773600.

The previous prime is 401581399. The next prime is 401581501. The reversal of 401581428 is 824185104.

It is a super-2 number, since 2×401581428² = 322535286629038368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10003 + ... + 30053.

It is an arithmetic number, because the mean of its divisors is an integer number (39067980).

Almost surely, 2^401581428 is an apocalyptic number.

It is an amenable number.

401581428 is an abundant number, since it is smaller than the sum of its proper divisors (536050092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401581428 is a wasteful number, since it uses less digits than its factorization.

401581428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21727 (or 21725 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 401581428 is about 20039.4967002667. The cubic root of 401581428 is about 737.7760279799.

The spelling of 401581428 in words is "four hundred one million, five hundred eighty-one thousand, four hundred twenty-eight".