401581402 has 4 divisors (see below), whose sum is σ = 602372106. Its totient is φ = 200790700.

The previous prime is 401581399. The next prime is 401581501. The reversal of 401581402 is 204185104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 401561521 + 19881 = 20039^2 + 141^2 .

It is a super-2 number, since 2×401581402² = 322535244864571208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100395349 + ... + 100395352.

Almost surely, 2^401581402 is an apocalyptic number.

401581402 is a deficient number, since it is larger than the sum of its proper divisors (200790704).

401581402 is a wasteful number, since it uses less digits than its factorization.

401581402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200790703.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 401581402 is about 20039.4960515478. The cubic root of 401581402 is about 737.7760120577.

The spelling of 401581402 in words is "four hundred one million, five hundred eighty-one thousand, four hundred two".