1307990 has 16 divisors (see below), whose sum is σ = 2373840. Its totient is φ = 518880.

The previous prime is 1307981. The next prime is 1307993. The reversal of 1307990 is 997031.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1307993) 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 7 ways as a sum of consecutive naturals, for example, 920 + ... + 1860.

It is an arithmetic number, because the mean of its divisors is an integer number (148365).

2^1307990 is an apocalyptic number.

1307990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1307990 is a deficient number, since it is larger than the sum of its proper divisors (1065850).

1307990 is a wasteful number, since it uses less digits than its factorization.

1307990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 1307990 is about 1143.6739045725. The cubic root of 1307990 is about 109.3624273984.

The spelling of 1307990 in words is "one million, three hundred seven thousand, nine hundred ninety".