1402689397 has 4 divisors (see below), whose sum is σ = 1485200556. Its totient is φ = 1320178240.

The previous prime is 1402689389. The next prime is 1402689437. The reversal of 1402689397 is 7939862041.

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

It can be written as a sum of positive squares in 2 ways, for example, as 763914321 + 638775076 = 27639^2 + 25274^2 .

It is a cyclic number.

It is not a de Polignac number, because 1402689397 - 2³ = 1402689389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1402689397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1402689367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41255554 + ... + 41255587.

It is an arithmetic number, because the mean of its divisors is an integer number (371300139).

Almost surely, 2^1402689397 is an apocalyptic number.

1402689397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1402689397 is a deficient number, since it is larger than the sum of its proper divisors (82511159).

1402689397 is an equidigital number, since it uses as much as digits as its factorization.

1402689397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82511158.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 1402689397 is about 37452.4952039247. The cubic root of 1402689397 is about 1119.4048168991.

The spelling of 1402689397 in words is "one billion, four hundred two million, six hundred eighty-nine thousand, three hundred ninety-seven".