1606620994 has 16 divisors (see below), whose sum is σ = 2630579040. Its totient is φ = 729848160.

The previous prime is 1606620971. The next prime is 1606621013. The reversal of 1606620994 is 4990266061.

It is a happy number.

It is a super-3 number, since 3×1606620994³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1606620994.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17737 + ... + 59395.

It is an arithmetic number, because the mean of its divisors is an integer number (164411190).

Almost surely, 2^1606620994 is an apocalyptic number.

1606620994 is a deficient number, since it is larger than the sum of its proper divisors (1023958046).

1606620994 is a wasteful number, since it uses less digits than its factorization.

1606620994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43425.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 1606620994 is about 40082.6769814592. The cubic root of 1606620994 is about 1171.2182003336.

The spelling of 1606620994 in words is "one billion, six hundred six million, six hundred twenty thousand, nine hundred ninety-four".