1958866402 has 4 divisors (see below), whose sum is σ = 2938299606. Its totient is φ = 979433200.

The previous prime is 1958866391. The next prime is 1958866411. The reversal of 1958866402 is 2046688591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2046688591 = 659 ⋅3105749.

It can be written as a sum of positive squares in only one way, i.e., 1929932761 + 28933641 = 43931^2 + 5379^2 .

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, 489716599 + ... + 489716602.

Almost surely, 2^1958866402 is an apocalyptic number.

1958866402 is a deficient number, since it is larger than the sum of its proper divisors (979433204).

1958866402 is an equidigital number, since it uses as much as digits as its factorization.

1958866402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979433203.

The product of its (nonzero) digits is 829440, while the sum is 49.

The square root of 1958866402 is about 44259.0827062649. The cubic root of 1958866402 is about 1251.2236342113.

The spelling of 1958866402 in words is "one billion, nine hundred fifty-eight million, eight hundred sixty-six thousand, four hundred two".