1620143426 has 16 divisors (see below), whose sum is σ = 2652108480. Its totient is φ = 736160880.

The previous prime is 1620143423. The next prime is 1620143429. The reversal of 1620143426 is 6243410261.

It is an interprime number because it is at equal distance from previous prime (1620143423) and next prime (1620143429).

It is a super-2 number, since 2×1620143426² = 5249729441622034952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1620143423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56555 + ... + 80241.

It is an arithmetic number, because the mean of its divisors is an integer number (165756780).

Almost surely, 2^1620143426 is an apocalyptic number.

1620143426 is a deficient number, since it is larger than the sum of its proper divisors (1031965054).

1620143426 is a wasteful number, since it uses less digits than its factorization.

1620143426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26809.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1620143426 is about 40251.0052793716. The cubic root of 1620143426 is about 1174.4949514393.

Adding to 1620143426 its reverse (6243410261), we get a palindrome (7863553687).

The spelling of 1620143426 in words is "one billion, six hundred twenty million, one hundred forty-three thousand, four hundred twenty-six".