801521240 has 64 divisors (see below), whose sum is σ = 1956497760. Its totient is φ = 293760000.

The previous prime is 801521233. The next prime is 801521249. The reversal of 801521240 is 42125108.

It is a super-2 number, since 2×801521240² = 1284872596342275200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801521249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65615 + ... + 76865.

Almost surely, 2^801521240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 801521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978248880).

801521240 is an abundant number, since it is smaller than the sum of its proper divisors (1154976520).

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

801521240 is a wasteful number, since it uses less digits than its factorization.

801521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11412 (or 11408 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 801521240 is about 28311.1504534874. The cubic root of 801521240 is about 928.9058083662.

Adding to 801521240 its reverse (42125108), we get a palindrome (843646348).

The spelling of 801521240 in words is "eight hundred one million, five hundred twenty-one thousand, two hundred forty".