1645990094 has 8 divisors (see below), whose sum is σ = 2821697328. Its totient is φ = 705424320.

The previous prime is 1645990081. The next prime is 1645990117. The reversal of 1645990094 is 4900995461.

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

It is a super-2 number, since 2×1645990094² = 5418566779092257672, which contains 22 as substring.

It is a congruent 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, 58785347 + ... + 58785374.

It is an arithmetic number, because the mean of its divisors is an integer number (352712166).

Almost surely, 2^1645990094 is an apocalyptic number.

1645990094 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1645990094 is a deficient number, since it is larger than the sum of its proper divisors (1175707234).

1645990094 is a wasteful number, since it uses less digits than its factorization.

1645990094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117570730.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 1645990094 is about 40570.8034675184. The cubic root of 1645990094 is about 1180.7077277926.

The spelling of 1645990094 in words is "one billion, six hundred forty-five million, nine hundred ninety thousand, ninety-four".