429599978 has 4 divisors (see below), whose sum is σ = 644399970. Its totient is φ = 214799988.

The previous prime is 429599977. The next prime is 429599999. The reversal of 429599978 is 879995924.

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

It can be written as a sum of positive squares in only one way, i.e., 384669769 + 44930209 = 19613^2 + 6703^2 .

It is a super-2 number, since 2×429599978² = 369112282195200968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 429599978.

It is not an unprimeable number, because it can be changed into a prime (429599977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107399993 + ... + 107399996.

Almost surely, 2^429599978 is an apocalyptic number.

429599978 is a deficient number, since it is larger than the sum of its proper divisors (214799992).

429599978 is a wasteful number, since it uses less digits than its factorization.

429599978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214799991.

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

The square root of 429599978 is about 20726.7937221366. The cubic root of 429599978 is about 754.5501043178.

The spelling of 429599978 in words is "four hundred twenty-nine million, five hundred ninety-nine thousand, nine hundred seventy-eight".