402023144 has 8 divisors (see below), whose sum is σ = 753793410. Its totient is φ = 201011568.

The previous prime is 402023137. The next prime is 402023161. The reversal of 402023144 is 441320204.

It can be written as a sum of positive squares in only one way, i.e., 370100644 + 31922500 = 19238^2 + 5650^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×402023144³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25126439 + ... + 25126454.

Almost surely, 2^402023144 is an apocalyptic number.

It is an amenable number.

402023144 is a deficient number, since it is larger than the sum of its proper divisors (351770266).

402023144 is a wasteful number, since it uses less digits than its factorization.

402023144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50252899 (or 50252895 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 402023144 is about 20050.5148063585. The cubic root of 402023144 is about 738.0464323036.

Adding to 402023144 its reverse (441320204), we get a palindrome (843343348).

The spelling of 402023144 in words is "four hundred two million, twenty-three thousand, one hundred forty-four".