521238942 has 64 divisors (see below), whose sum is σ = 1335605760. Its totient is φ = 147595392.

The previous prime is 521238937. The next prime is 521238947. The reversal of 521238942 is 249832125.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (521238937) and next prime (521238947).

It is a junction number, because it is equal to n+sod(n) for n = 521238897 and 521238906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521238947) 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 31 ways as a sum of consecutive naturals, for example, 36613 + ... + 48815.

It is an arithmetic number, because the mean of its divisors is an integer number (20868840).

Almost surely, 2^521238942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521238942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (667802880).

521238942 is an abundant number, since it is smaller than the sum of its proper divisors (814366818).

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

521238942 is a wasteful number, since it uses less digits than its factorization.

521238942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12334 (or 12328 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 521238942 is about 22830.6579405851. The cubic root of 521238942 is about 804.7832921035.

The spelling of 521238942 in words is "five hundred twenty-one million, two hundred thirty-eight thousand, nine hundred forty-two".