149421023 has 4 divisors (see below), whose sum is σ = 154241088. Its totient is φ = 144600960.

The previous prime is 149421011. The next prime is 149421043. The reversal of 149421023 is 320124941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 149421023 - 2¹⁴ = 149404639 is a prime.

It is a super-2 number, since 2×149421023² = 44653284228733058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 149420983 and 149421001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149421043) 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, 2409986 + ... + 2410047.

It is an arithmetic number, because the mean of its divisors is an integer number (38560272).

Almost surely, 2^149421023 is an apocalyptic number.

149421023 is a deficient number, since it is larger than the sum of its proper divisors (4820065).

149421023 is an equidigital number, since it uses as much as digits as its factorization.

149421023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820064.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 149421023 is about 12223.7892242954. The cubic root of 149421023 is about 530.6447866260.

Adding to 149421023 its reverse (320124941), we get a palindrome (469545964).

The spelling of 149421023 in words is "one hundred forty-nine million, four hundred twenty-one thousand, twenty-three".