1906814021 has 8 divisors (see below), whose sum is σ = 2179490304. Its totient is φ = 1634206320.

The previous prime is 1906813969. The next prime is 1906814051. The reversal of 1906814021 is 1204186091.

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

It is a cyclic number.

It is not a de Polignac number, because 1906814021 - 2²² = 1902619717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1906814051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76691 + ... + 98463.

It is an arithmetic number, because the mean of its divisors is an integer number (272436288).

Almost surely, 2^1906814021 is an apocalyptic number.

It is an amenable number.

1906814021 is a deficient number, since it is larger than the sum of its proper divisors (272676283).

1906814021 is a wasteful number, since it uses less digits than its factorization.

1906814021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34291.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1906814021 is about 43667.0816634224. The cubic root of 1906814021 is about 1240.0411929170.

The spelling of 1906814021 in words is "one billion, nine hundred six million, eight hundred fourteen thousand, twenty-one".