1402991989 has 8 divisors (see below), whose sum is σ = 1611478400. Its totient is φ = 1196520336.

The previous prime is 1402991959. The next prime is 1402991999. The reversal of 1402991989 is 9891992041.

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 1402991989 - 2⁹ = 1402991477 is a prime.

It is a super-2 number, since 2×1402991989² = 3936773042396352242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1402991959) 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, 502194 + ... + 504979.

It is an arithmetic number, because the mean of its divisors is an integer number (201434800).

Almost surely, 2^1402991989 is an apocalyptic number.

It is an amenable number.

1402991989 is a deficient number, since it is larger than the sum of its proper divisors (208486411).

1402991989 is a wasteful number, since it uses less digits than its factorization.

1402991989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007379.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 1402991989 is about 37456.5346635270. The cubic root of 1402991989 is about 1119.4853048031.

Adding to 1402991989 its sum of digits (52), we get a palindrome (1402992041).

The spelling of 1402991989 in words is "one billion, four hundred two million, nine hundred ninety-one thousand, nine hundred eighty-nine".