40406402 has 8 divisors (see below), whose sum is σ = 62088012. Its totient is φ = 19710400.

The previous prime is 40406383. The next prime is 40406437. The reversal of 40406402 is 20460404.

It can be written as a sum of positive squares in 2 ways, for example, as 33651601 + 6754801 = 5801^2 + 2599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246299 + ... + 246462.

Almost surely, 2^40406402 is an apocalyptic number.

40406402 is a deficient number, since it is larger than the sum of its proper divisors (21681610).

40406402 is a wasteful number, since it uses less digits than its factorization.

40406402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492804.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 40406402 is about 6356.6030236283. The cubic root of 40406402 is about 343.1495181788.

Adding to 40406402 its reverse (20460404), we get a palindrome (60866806).

The spelling of 40406402 in words is "forty million, four hundred six thousand, four hundred two".