401240664 has 144 divisors (see below), whose sum is σ = 1260038520. Its totient is φ = 114370560.

The previous prime is 401240641. The next prime is 401240683. The reversal of 401240664 is 466042104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 228012 + ... + 229764.

Almost surely, 2^401240664 is an apocalyptic number.

401240664 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401240664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (630019260).

401240664 is an abundant number, since it is smaller than the sum of its proper divisors (858797856).

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

401240664 is a wasteful number, since it uses less digits than its factorization.

401240664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 401240664 is about 20030.9925864896. The cubic root of 401240664 is about 737.5672877034.

Adding to 401240664 its reverse (466042104), we get a palindrome (867282768).

The spelling of 401240664 in words is "four hundred one million, two hundred forty thousand, six hundred sixty-four".