402140023 has 4 divisors (see below), whose sum is σ = 402180280. Its totient is φ = 402099768.

The previous prime is 402140017. The next prime is 402140033. The reversal of 402140023 is 320041204.

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.

It is a cyclic number.

It is not a de Polignac number, because 402140023 - 2¹³ = 402131831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402139979 and 402140006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402140033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7468 + ... + 29326.

It is an arithmetic number, because the mean of its divisors is an integer number (100545070).

Almost surely, 2^402140023 is an apocalyptic number.

402140023 is a deficient number, since it is larger than the sum of its proper divisors (40257).

402140023 is a wasteful number, since it uses less digits than its factorization.

402140023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40256.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 402140023 is about 20053.4292079933. The cubic root of 402140023 is about 738.1179487258.

Adding to 402140023 its reverse (320041204), we get a palindrome (722181227).

It can be divided in two parts, 4021 and 40023, that added together give a palindrome (44044).

The spelling of 402140023 in words is "four hundred two million, one hundred forty thousand, twenty-three".