993905642 has 4 divisors (see below), whose sum is σ = 1490858466. Its totient is φ = 496952820.

The previous prime is 993905623. The next prime is 993905807. The reversal of 993905642 is 246509399.

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., 593945641 + 399960001 = 24371^2 + 19999^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248476409 + ... + 248476412.

Almost surely, 2^993905642 is an apocalyptic number.

993905642 is a deficient number, since it is larger than the sum of its proper divisors (496952824).

993905642 is a wasteful number, since it uses less digits than its factorization.

993905642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496952823.

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 993905642 is about 31526.2690783416. The cubic root of 993905642 is about 997.9644065040.

The spelling of 993905642 in words is "nine hundred ninety-three million, nine hundred five thousand, six hundred forty-two".