1620401245 has 16 divisors (see below), whose sum is σ = 2013183360. Its totient is φ = 1250593344.

The previous prime is 1620401227. The next prime is 1620401269. The reversal of 1620401245 is 5421040261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1620401245 - 2¹³ = 1620393053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205954 + ... + 213676.

It is an arithmetic number, because the mean of its divisors is an integer number (125823960).

Almost surely, 2^1620401245 is an apocalyptic number.

It is an amenable number.

1620401245 is a deficient number, since it is larger than the sum of its proper divisors (392782115).

1620401245 is a wasteful number, since it uses less digits than its factorization.

1620401245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1620401245 is about 40254.2077924780. The cubic root of 1620401245 is about 1174.5572486097.

The spelling of 1620401245 in words is "one billion, six hundred twenty million, four hundred one thousand, two hundred forty-five".