402158581 has 8 divisors (see below), whose sum is σ = 442174464. Its totient is φ = 362718720.

The previous prime is 402158569. The next prime is 402158597. The reversal of 402158581 is 185851204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402158581 - 2¹¹ = 402156533 is a prime.

It is a super-2 number, since 2×402158581² = 323463048543867122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402158551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142540 + ... + 145333.

It is an arithmetic number, because the mean of its divisors is an integer number (55271808).

Almost surely, 2^402158581 is an apocalyptic number.

It is an amenable number.

402158581 is a deficient number, since it is larger than the sum of its proper divisors (40015883).

402158581 is a wasteful number, since it uses less digits than its factorization.

402158581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288011.

The product of its (nonzero) digits is 12800, while the sum is 34.

The square root of 402158581 is about 20053.8919165333. The cubic root of 402158581 is about 738.1293027993.

The spelling of 402158581 in words is "four hundred two million, one hundred fifty-eight thousand, five hundred eighty-one".