401661546 has 32 divisors (see below), whose sum is σ = 943766208. Its totient is φ = 112352640.

The previous prime is 401661541. The next prime is 401661587. The reversal of 401661546 is 645166104.

It is a happy number.

It is a super-2 number, since 2×401661546² = 322663995070220232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (401661541) 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, 233211 + ... + 234926.

It is an arithmetic number, because the mean of its divisors is an integer number (29492694).

Almost surely, 2^401661546 is an apocalyptic number.

401661546 is an abundant number, since it is smaller than the sum of its proper divisors (542104662).

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

401661546 is a wasteful number, since it uses less digits than its factorization.

401661546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468166.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 401661546 is about 20041.4956028736. The cubic root of 401661546 is about 737.8250883574.

The spelling of 401661546 in words is "four hundred one million, six hundred sixty-one thousand, five hundred forty-six".