1672905 has 32 divisors (see below), whose sum is σ = 3015936. Its totient is φ = 785664.

The previous prime is 1672901. The next prime is 1672921. The reversal of 1672905 is 5092761.

It is not a de Polignac number, because 1672905 - 2² = 1672901 is a prime.

It is a super-2 number, since 2×1672905² = 5597222278050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1672901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4299 + ... + 4671.

It is an arithmetic number, because the mean of its divisors is an integer number (94248).

2^1672905 is an apocalyptic number.

1672905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1672905 is a deficient number, since it is larger than the sum of its proper divisors (1343031).

1672905 is a wasteful number, since it uses less digits than its factorization.

1672905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 1672905 is about 1293.4082882060. The cubic root of 1672905 is about 118.7108532090.

The spelling of 1672905 in words is "one million, six hundred seventy-two thousand, nine hundred five".