1321407 has 16 divisors (see below), whose sum is σ = 1980000. Its totient is φ = 870912.

The previous prime is 1321399. The next prime is 1321409. The reversal of 1321407 is 7041231.

1321407 = T₉₈ + T₉₉ + ... + T₂₀₆.

It is not a de Polignac number, because 1321407 - 2³ = 1321399 is a prime.

It is a super-2 number, since 2×1321407² = 3492232919298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2719 + ... + 3167.

It is an arithmetic number, because the mean of its divisors is an integer number (123750).

2^1321407 is an apocalyptic number.

1321407 is a deficient number, since it is larger than the sum of its proper divisors (658593).

1321407 is a wasteful number, since it uses less digits than its factorization.

1321407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1321407 is about 1149.5246843805. The cubic root of 1321407 is about 109.7350925766.

Adding to 1321407 its reverse (7041231), we get a palindrome (8362638).

It can be divided in two parts, 1321 and 407, that added together give a cube (1728 = 12³).

The spelling of 1321407 in words is "one million, three hundred twenty-one thousand, four hundred seven".