7389890 has 8 divisors (see below), whose sum is σ = 13301820. Its totient is φ = 2955952.

The previous prime is 7389871. The next prime is 7389901. The reversal of 7389890 is 989837.

It can be written as a sum of positive squares in 2 ways, for example, as 7252249 + 137641 = 2693^2 + 371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7389890² = 109220948424200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369485 + ... + 369504.

Almost surely, 2^7389890 is an apocalyptic number.

7389890 is a deficient number, since it is larger than the sum of its proper divisors (5911930).

7389890 is a wasteful number, since it uses less digits than its factorization.

7389890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738996.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 7389890 is about 2718.4352116613. The cubic root of 7389890 is about 194.7807309610.

The spelling of 7389890 in words is "seven million, three hundred eighty-nine thousand, eight hundred ninety".