4001398 has 4 divisors (see below), whose sum is σ = 6002100. Its totient is φ = 2000698.

The previous prime is 4001383. The next prime is 4001399. The reversal of 4001398 is 8931004.

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

It is a super-2 number, since 2×4001398² = 32022371908808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000348 + ... + 1000351.

It is an arithmetic number, because the mean of its divisors is an integer number (1500525).

Almost surely, 2^4001398 is an apocalyptic number.

4001398 is a deficient number, since it is larger than the sum of its proper divisors (2000702).

4001398 is a wasteful number, since it uses less digits than its factorization.

4001398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000701.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 4001398 is about 2000.3494694678. The cubic root of 4001398 is about 158.7585962650.

The spelling of 4001398 in words is "four million, one thousand, three hundred ninety-eight".