1402689391 has 4 divisors (see below), whose sum is σ = 1403763912. Its totient is φ = 1401614872.

The previous prime is 1402689389. The next prime is 1402689437. The reversal of 1402689391 is 1939862041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939862041 = 13 ⋅149220157.

It is a cyclic number.

It is not a de Polignac number, because 1402689391 - 2¹ = 1402689389 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 (1402689331) 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, 535300 + ... + 537913.

It is an arithmetic number, because the mean of its divisors is an integer number (350940978).

Almost surely, 2^1402689391 is an apocalyptic number.

1402689391 is a deficient number, since it is larger than the sum of its proper divisors (1074521).

1402689391 is a wasteful number, since it uses less digits than its factorization.

1402689391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074520.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1402689391 is about 37452.4951238232. The cubic root of 1402689391 is about 1119.4048153030.

The spelling of 1402689391 in words is "one billion, four hundred two million, six hundred eighty-nine thousand, three hundred ninety-one".