1670745 has 16 divisors (see below), whose sum is σ = 2760192. Its totient is φ = 862080.

The previous prime is 1670741. The next prime is 1670761. The reversal of 1670745 is 5470761.

It is a happy number.

It is not a de Polignac number, because 1670745 - 2² = 1670741 is a prime.

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 (1670741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1332 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (172512).

2^1670745 is an apocalyptic number.

1670745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1670745 is a deficient number, since it is larger than the sum of its proper divisors (1089447).

1670745 is a wasteful number, since it uses less digits than its factorization.

1670745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 1670745 is about 1292.5730153457. The cubic root of 1670745 is about 118.6597393521.

It can be divided in two parts, 1670 and 745, that added together give a triangular number (2415 = T₆₉).

The spelling of 1670745 in words is "one million, six hundred seventy thousand, seven hundred forty-five".