401078989 has 4 divisors (see below), whose sum is σ = 402291040. Its totient is φ = 399866940.

The previous prime is 401078983. The next prime is 401079043. The reversal of 401078989 is 989870104.

It is a happy number.

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 not a de Polignac number, because 401078989 - 2⁵ = 401078957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401078983) 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, 605529 + ... + 606190.

It is an arithmetic number, because the mean of its divisors is an integer number (100572760).

Almost surely, 2^401078989 is an apocalyptic number.

It is an amenable number.

401078989 is a deficient number, since it is larger than the sum of its proper divisors (1212051).

401078989 is a wasteful number, since it uses less digits than its factorization.

401078989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212050.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 401078989 is about 20026.9565585987. The cubic root of 401078989 is about 737.4682098334.

The spelling of 401078989 in words is "four hundred one million, seventy-eight thousand, nine hundred eighty-nine".