1620157253 has 8 divisors (see below), whose sum is σ = 1903401696. Its totient is φ = 1359572400.

The previous prime is 1620157243. The next prime is 1620157291. The reversal of 1620157253 is 3527510261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620157253 - 2⁸ = 1620156997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620157213) 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, 5664743 + ... + 5665028.

It is an arithmetic number, because the mean of its divisors is an integer number (237925212).

Almost surely, 2^1620157253 is an apocalyptic number.

1620157253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1620157253 is a deficient number, since it is larger than the sum of its proper divisors (283244443).

1620157253 is a wasteful number, since it uses less digits than its factorization.

1620157253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11329795.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1620157253 is about 40251.1770386904. The cubic root of 1620157253 is about 1174.4982926447.

The spelling of 1620157253 in words is "one billion, six hundred twenty million, one hundred fifty-seven thousand, two hundred fifty-three".