4001406 has 8 divisors (see below), whose sum is σ = 8002824. Its totient is φ = 1333800.

The previous prime is 4001399. The next prime is 4001407. The reversal of 4001406 is 6041004.

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

4001406 is an admirable number.

It is a super-2 number, since 2×4001406² = 32022499953672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001407) 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, 333445 + ... + 333456.

It is an arithmetic number, because the mean of its divisors is an integer number (1000353).

Almost surely, 2^4001406 is an apocalyptic number.

4001406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4001406 is a wasteful number, since it uses less digits than its factorization.

4001406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666906.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 4001406 is about 2000.3514691174. The cubic root of 4001406 is about 158.7587020670.

The spelling of 4001406 in words is "four million, one thousand, four hundred six".