997985429 has 4 divisors (see below), whose sum is σ = 1140554784. Its totient is φ = 855416076.

The previous prime is 997985383. The next prime is 997985441. The reversal of 997985429 is 924589799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 997985429 - 2⁸ = 997985173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997985489) 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, 71284667 + ... + 71284680.

It is an arithmetic number, because the mean of its divisors is an integer number (285138696).

Almost surely, 2^997985429 is an apocalyptic number.

It is an amenable number.

997985429 is a deficient number, since it is larger than the sum of its proper divisors (142569355).

997985429 is a wasteful number, since it uses less digits than its factorization.

997985429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142569354.

The product of its digits is 14696640, while the sum is 62.

The square root of 997985429 is about 31590.9073785480. The cubic root of 997985429 is about 999.3280248839.

The spelling of 997985429 in words is "nine hundred ninety-seven million, nine hundred eighty-five thousand, four hundred twenty-nine".