400000402 has 4 divisors (see below), whose sum is σ = 600000606. Its totient is φ = 200000200.

The previous prime is 400000373. The next prime is 400000411. The reversal of 400000402 is 204000004.

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., 399960001 + 40401 = 19999^2 + 201^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100000099 + ... + 100000102.

Almost surely, 2^400000402 is an apocalyptic number.

400000402 is a deficient number, since it is larger than the sum of its proper divisors (200000204).

400000402 is a wasteful number, since it uses less digits than its factorization.

400000402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200000203.

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400000402 is about 20000.0100499975. The cubic root of 400000402 is about 736.8065465581.

Adding to 400000402 its reverse (204000004), we get a palindrome (604000406).

The spelling of 400000402 in words is "four hundred million, four hundred two", and thus it is an aban number.