400134491 has 4 divisors (see below), whose sum is σ = 423671832. Its totient is φ = 376597152.

The previous prime is 400134467. The next prime is 400134523. The reversal of 400134491 is 194431004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400134491 is a prime.

It is a super-2 number, since 2×400134491² = 320215221775658162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400134491.

It is not an unprimeable number, because it can be changed into a prime (400134421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11768645 + ... + 11768678.

It is an arithmetic number, because the mean of its divisors is an integer number (105917958).

Almost surely, 2^400134491 is an apocalyptic number.

400134491 is a deficient number, since it is larger than the sum of its proper divisors (23537341).

400134491 is a wasteful number, since it uses less digits than its factorization.

400134491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23537340.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 400134491 is about 20003.3619924252. The cubic root of 400134491 is about 736.8888686548. Note that the first 4 decimals are identical.

Adding to 400134491 its reverse (194431004), we get a palindrome (594565495).

The spelling of 400134491 in words is "four hundred million, one hundred thirty-four thousand, four hundred ninety-one".