1623354157 has 4 divisors (see below), whose sum is σ = 1718845596. Its totient is φ = 1527862720.

The previous prime is 1623354149. The next prime is 1623354181. The reversal of 1623354157 is 7514533261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7514533261 = 1493 ⋅5033177.

It can be written as a sum of positive squares in 2 ways, for example, as 481319721 + 1142034436 = 21939^2 + 33794^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623354157 - 2³ = 1623354149 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 (1623354107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47745694 + ... + 47745727.

It is an arithmetic number, because the mean of its divisors is an integer number (429711399).

Almost surely, 2^1623354157 is an apocalyptic number.

1623354157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1623354157 is a deficient number, since it is larger than the sum of its proper divisors (95491439).

1623354157 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 1623354157 = (4163557231)₉.

1623354157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95491438.

The product of its digits is 75600, while the sum is 37.

The square root of 1623354157 is about 40290.8693999025. The cubic root of 1623354157 is about 1175.2702941174.

The spelling of 1623354157 in words is "one billion, six hundred twenty-three million, three hundred fifty-four thousand, one hundred fifty-seven".