1405816402 has 4 divisors (see below), whose sum is σ = 2108724606. Its totient is φ = 702908200.

The previous prime is 1405816387. The next prime is 1405816453. The reversal of 1405816402 is 2046185041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2046185041 = 23 ⋅88964567.

It can be written as a sum of positive squares in only one way, i.e., 1244043441 + 161772961 = 35271^2 + 12719^2 .

It is a super-2 number, since 2×1405816402² = 3952639512264451208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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, 351454099 + ... + 351454102.

Almost surely, 2^1405816402 is an apocalyptic number.

1405816402 is a deficient number, since it is larger than the sum of its proper divisors (702908204).

1405816402 is an equidigital number, since it uses as much as digits as its factorization.

1405816402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702908203.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1405816402 is about 37494.2182476179. The cubic root of 1405816402 is about 1120.2360264685.

The spelling of 1405816402 in words is "one billion, four hundred five million, eight hundred sixteen thousand, four hundred two".