401978494 has 4 divisors (see below), whose sum is σ = 602967744. Its totient is φ = 200989246.

The previous prime is 401978477. The next prime is 401978501. The reversal of 401978494 is 494879104.

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

It is a super-3 number, since 3×401978494³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100494622 + ... + 100494625.

It is an arithmetic number, because the mean of its divisors is an integer number (150741936).

Almost surely, 2^401978494 is an apocalyptic number.

401978494 is a deficient number, since it is larger than the sum of its proper divisors (200989250).

401978494 is a wasteful number, since it uses less digits than its factorization.

401978494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200989249.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 401978494 is about 20049.4013376958. The cubic root of 401978494 is about 738.0191080116.

The spelling of 401978494 in words is "four hundred one million, nine hundred seventy-eight thousand, four hundred ninety-four".