201400391 has 4 divisors (see below), whose sum is σ = 201428784. Its totient is φ = 201372000.

The previous prime is 201400387. The next prime is 201400393. The reversal of 201400391 is 193004102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 193004102 = 2 ⋅96502051.

It is a cyclic number.

It is not a de Polignac number, because 201400391 - 2² = 201400387 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 (201400393) 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, 6566 + ... + 21116.

It is an arithmetic number, because the mean of its divisors is an integer number (50357196).

Almost surely, 2^201400391 is an apocalyptic number.

201400391 is a deficient number, since it is larger than the sum of its proper divisors (28393).

201400391 is a wasteful number, since it uses less digits than its factorization.

201400391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28392.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 201400391 is about 14191.5605554851. The cubic root of 201400391 is about 586.1652969764.

Adding to 201400391 its reverse (193004102), we get a palindrome (394404493).

The spelling of 201400391 in words is "two hundred one million, four hundred thousand, three hundred ninety-one".