402734978 has 4 divisors (see below), whose sum is σ = 604102470. Its totient is φ = 201367488.

The previous prime is 402734971. The next prime is 402734989. The reversal of 402734978 is 879437204.

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., 353552809 + 49182169 = 18803^2 + 7013^2 .

It is a super-4 number, since 4×402734978⁴ (a number of 36 digits) contains 4444 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402734971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100683743 + ... + 100683746.

Almost surely, 2^402734978 is an apocalyptic number.

402734978 is a deficient number, since it is larger than the sum of its proper divisors (201367492).

402734978 is a wasteful number, since it uses less digits than its factorization.

402734978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201367491.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 402734978 is about 20068.2579712341. The cubic root of 402734978 is about 738.4817776977.

The spelling of 402734978 in words is "four hundred two million, seven hundred thirty-four thousand, nine hundred seventy-eight".