144400402 has 4 divisors (see below), whose sum is σ = 216600606. Its totient is φ = 72200200.

The previous prime is 144400369. The next prime is 144400423. The reversal of 144400402 is 204004441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204004441 = 2663 ⋅76607.

It can be written as a sum of positive squares in only one way, i.e., 142062561 + 2337841 = 11919^2 + 1529^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 144400402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36100099 + ... + 36100102.

Almost surely, 2^144400402 is an apocalyptic number.

144400402 is a deficient number, since it is larger than the sum of its proper divisors (72200204).

144400402 is an equidigital number, since it uses as much as digits as its factorization.

144400402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72200203.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 144400402 is about 12016.6718354127. The cubic root of 144400402 is about 524.6336394892.

Adding to 144400402 its reverse (204004441), we get a palindrome (348404843).

The spelling of 144400402 in words is "one hundred forty-four million, four hundred thousand, four hundred two".