1400409 has 28 divisors (see below), whose sum is σ = 2242836. Its totient is φ = 870912.

The previous prime is 1400387. The next prime is 1400411. The reversal of 1400409 is 9040041.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 944784 = 675^2 + 972^2 .

It is not a de Polignac number, because 1400409 - 2¹⁷ = 1269337 is a prime.

It is a super-2 number, since 2×1400409² = 3922290734562, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1400391 and 1400400.

It is not an unprimeable number, because it can be changed into a prime (1400449) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 12337 + ... + 12449.

2^1400409 is an apocalyptic number.

It is an amenable number.

1400409 is a deficient number, since it is larger than the sum of its proper divisors (842427).

1400409 is an equidigital number, since it uses as much as digits as its factorization.

1400409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1400409 is about 1183.3887780438. The cubic root of 1400409 is about 111.8797870469.

The spelling of 1400409 in words is "one million, four hundred thousand, four hundred nine".