1618402 has 4 divisors (see below), whose sum is σ = 2427606. Its totient is φ = 809200.

The previous prime is 1618399. The next prime is 1618411. The reversal of 1618402 is 2048161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2048161 = 73 ⋅28057.

It can be written as a sum of positive squares in only one way, i.e., 1515361 + 103041 = 1231^2 + 321^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404599 + ... + 404602.

2^1618402 is an apocalyptic number.

1618402 is a deficient number, since it is larger than the sum of its proper divisors (809204).

1618402 is an equidigital number, since it uses as much as digits as its factorization.

1618402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809203.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1618402 is about 1272.1642975654. The cubic root of 1618402 is about 117.4073995029.

The spelling of 1618402 in words is "one million, six hundred eighteen thousand, four hundred two".