149540721 has 32 divisors (see below), whose sum is σ = 231984000. Its totient is φ = 84679680.

The previous prime is 149540711. The next prime is 149540723. The reversal of 149540721 is 127045941.

It is a happy number.

It is not a de Polignac number, because 149540721 - 2⁵ = 149540689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (149540723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82695 + ... + 84483.

It is an arithmetic number, because the mean of its divisors is an integer number (7249500).

Almost surely, 2^149540721 is an apocalyptic number.

149540721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

149540721 is a deficient number, since it is larger than the sum of its proper divisors (82443279).

149540721 is a wasteful number, since it uses less digits than its factorization.

149540721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 149540721 is about 12228.6843527830. The cubic root of 149540721 is about 530.7864448863.

The spelling of 149540721 in words is "one hundred forty-nine million, five hundred forty thousand, seven hundred twenty-one".