4200400123391 has 4 divisors (see below), whose sum is σ = 4201203725352. Its totient is φ = 4199596521432.

The previous prime is 4200400123379. The next prime is 4200400123397. The reversal of 4200400123391 is 1933210040024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4200400123391 is a prime.

It is a super-2 number, since 2×4200400123391² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4200400123397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401793140 + ... + 401803593.

It is an arithmetic number, because the mean of its divisors is an integer number (1050300931338).

Almost surely, 2^{4200400123391} is an apocalyptic number.

4200400123391 is a deficient number, since it is larger than the sum of its proper divisors (803601961).

4200400123391 is an equidigital number, since it uses as much as digits as its factorization.

4200400123391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803601960.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 4200400123391 in words is "four trillion, two hundred billion, four hundred million, one hundred twenty-three thousand, three hundred ninety-one".