1020401402 has 8 divisors (see below), whose sum is σ = 1539450036. Its totient is φ = 507251392.

The previous prime is 1020401383. The next prime is 1020401407. The reversal of 1020401402 is 2041040201.

It can be written as a sum of positive squares in 2 ways, for example, as 1018184281 + 2217121 = 31909^2 + 1489^2 .

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

It is a super-4 number, since 4×1020401402⁴ (a number of 37 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1020401407) 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, 1474223 + ... + 1474914.

Almost surely, 2^1020401402 is an apocalyptic number.

1020401402 is a deficient number, since it is larger than the sum of its proper divisors (519048634).

1020401402 is a wasteful number, since it uses less digits than its factorization.

1020401402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949312.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1020401402 is about 31943.7224192798. The cubic root of 1020401402 is about 1006.7547381147.

Adding to 1020401402 its reverse (2041040201), we get a palindrome (3061441603).

The spelling of 1020401402 in words is "one billion, twenty million, four hundred one thousand, four hundred two".