401400209 has 64 divisors (see below), whose sum is σ = 537062400. Its totient is φ = 298045440.

The previous prime is 401400203. The next prime is 401400211. The reversal of 401400209 is 902004104.

It is not a de Polignac number, because 401400209 - 2⁴ = 401400193 is a prime.

It is a super-2 number, since 2×401400209² = 322244255570487362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401400203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5498597 + ... + 5498669.

It is an arithmetic number, because the mean of its divisors is an integer number (8391600).

Almost surely, 2^401400209 is an apocalyptic number.

401400209 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

401400209 is a deficient number, since it is larger than the sum of its proper divisors (135662191).

401400209 is a wasteful number, since it uses less digits than its factorization.

401400209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 401400209 is about 20034.9746443563. The cubic root of 401400209 is about 737.6650341765.

The spelling of 401400209 in words is "four hundred one million, four hundred thousand, two hundred nine".