1402639 has 8 divisors (see below), whose sum is σ = 1614848. Its totient is φ = 1193400.

The previous prime is 1402603. The next prime is 1402673. The reversal of 1402639 is 9362041.

1402639 = 310² + 311² + ... + 323².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1402639 - 2⁹ = 1402127 is a prime.

It is a Duffinian number.

1402639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1402699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (201856).

2^1402639 is an apocalyptic number.

1402639 is a deficient number, since it is larger than the sum of its proper divisors (212209).

1402639 is a wasteful number, since it uses less digits than its factorization.

1402639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1402639 is about 1184.3306126247. The cubic root of 1402639 is about 111.9391410434.

The spelling of 1402639 in words is "one million, four hundred two thousand, six hundred thirty-nine".