402248681 has 4 divisors (see below), whose sum is σ = 406154112. Its totient is φ = 398343252.

The previous prime is 402248669. The next prime is 402248683. The reversal of 402248681 is 186842204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402248681 is a prime.

It is a super-2 number, since 2×402248681² = 323608002732479522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402248683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1952561 + ... + 1952766.

It is an arithmetic number, because the mean of its divisors is an integer number (101538528).

Almost surely, 2^402248681 is an apocalyptic number.

It is an amenable number.

402248681 is a deficient number, since it is larger than the sum of its proper divisors (3905431).

402248681 is a wasteful number, since it uses less digits than its factorization.

402248681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905430.

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 402248681 is about 20056.1382374574. The cubic root of 402248681 is about 738.1844224190.

The spelling of 402248681 in words is "four hundred two million, two hundred forty-eight thousand, six hundred eighty-one".