1906387 has 4 divisors (see below), whose sum is σ = 2178736. Its totient is φ = 1634040.

The previous prime is 1906381. The next prime is 1906391. The reversal of 1906387 is 7836091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1906387 - 2³ = 1906379 is a prime.

It is a super-2 number, since 2×1906387² = 7268622787538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1906381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136164 + ... + 136177.

It is an arithmetic number, because the mean of its divisors is an integer number (544684).

2^1906387 is an apocalyptic number.

1906387 is a deficient number, since it is larger than the sum of its proper divisors (272349).

1906387 is an equidigital number, since it uses as much as digits as its factorization.

1906387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272348.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1906387 is about 1380.7197398459. The cubic root of 1906387 is about 123.9948619099.

The spelling of 1906387 in words is "one million, nine hundred six thousand, three hundred eighty-seven".