1400639 has 4 divisors (see below), whose sum is σ = 1433256. Its totient is φ = 1368024.

The previous prime is 1400627. The next prime is 1400653. The reversal of 1400639 is 9360041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1400639 - 2⁸ = 1400383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16244 + ... + 16329.

It is an arithmetic number, because the mean of its divisors is an integer number (358314).

2^1400639 is an apocalyptic number.

1400639 is a deficient number, since it is larger than the sum of its proper divisors (32617).

1400639 is an equidigital number, since it uses as much as digits as its factorization.

1400639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32616.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1400639 is about 1183.4859525994. The cubic root of 1400639 is about 111.8859116725.

The spelling of 1400639 in words is "one million, four hundred thousand, six hundred thirty-nine".