4540402 has 4 divisors (see below), whose sum is σ = 6810606. Its totient is φ = 2270200.

The previous prime is 4540397. The next prime is 4540423. The reversal of 4540402 is 2040454.

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

It can be written as a sum of positive squares in only one way, i.e., 4247721 + 292681 = 2061^2 + 541^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 4540402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1135099 + ... + 1135102.

Almost surely, 2^4540402 is an apocalyptic number.

4540402 is a deficient number, since it is larger than the sum of its proper divisors (2270204).

4540402 is a wasteful number, since it uses less digits than its factorization.

4540402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270203.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 4540402 is about 2130.8219071523. The cubic root of 4540402 is about 165.5889817013.

Adding to 4540402 its reverse (2040454), we get a palindrome (6580856).

The spelling of 4540402 in words is "four million, five hundred forty thousand, four hundred two".